12747990649 has 9 divisors (see below), whose sum is σ = 13329064623. Its totient is φ = 12191246232.

The previous prime is 12747990637. The next prime is 12747990659. The reversal of 12747990649 is 94609974721.

The square root of 12747990649 is 112907.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12654675049 + 93315600 = 112493^2 + 9660^2 .

It is not a de Polignac number, because 12747990649 - 2¹⁵ = 12747957881 is a prime.

It is a super-2 number, since 2×12747990649² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12747990593 and 12747990602.

It is not an unprimeable number, because it can be changed into a prime (12747990659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2594407 + ... + 2599315.

Almost surely, 2^12747990649 is an apocalyptic number.

12747990649 is the 112907-th square number.

12747990649 is the 56454-th centered octagonal number.

It is an amenable number.

12747990649 is a deficient number, since it is larger than the sum of its proper divisors (581073974).

12747990649 is an frugal number, since it uses more digits than its factorization.

12747990649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864 (or 4932 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 12747990649 in words is "twelve billion, seven hundred forty-seven million, nine hundred ninety thousand, six hundred forty-nine".