11707738621 has 4 divisors (see below), whose sum is σ = 11741285500. Its totient is φ = 11674191744.

The previous prime is 11707738529. The next prime is 11707738631. The reversal of 11707738621 is 12683770711.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9125980900 + 2581757721 = 95530^2 + 50811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11707738621 is a prime.

It is a super-2 number, since 2×11707738621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11707738631) 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 3 ways as a sum of consecutive naturals, for example, 16772916 + ... + 16773613.

It is an arithmetic number, because the mean of its divisors is an integer number (2935321375).

Almost surely, 2^11707738621 is an apocalyptic number.

It is an amenable number.

11707738621 is a deficient number, since it is larger than the sum of its proper divisors (33546879).

11707738621 is an equidigital number, since it uses as much as digits as its factorization.

11707738621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33546878.

The product of its (nonzero) digits is 98784, while the sum is 43.

The spelling of 11707738621 in words is "eleven billion, seven hundred seven million, seven hundred thirty-eight thousand, six hundred twenty-one".