19627649441 has 2 divisors, whose sum is σ = 19627649442. Its totient is φ = 19627649440.

The previous prime is 19627649399. The next prime is 19627649491. The reversal of 19627649441 is 14494672691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12785051041 + 6842598400 = 113071^2 + 82720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19627649441 is a prime.

It is a super-2 number, since 2×19627649441² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19627649491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9813824720 + 9813824721.

It is an arithmetic number, because the mean of its divisors is an integer number (9813824721).

Almost surely, 2^19627649441 is an apocalyptic number.

It is an amenable number.

19627649441 is a deficient number, since it is larger than the sum of its proper divisors (1).

19627649441 is an equidigital number, since it uses as much as digits as its factorization.

19627649441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The spelling of 19627649441 in words is "nineteen billion, six hundred twenty-seven million, six hundred forty-nine thousand, four hundred forty-one".