15649889537 has 2 divisors, whose sum is σ = 15649889538. Its totient is φ = 15649889536.

The previous prime is 15649889477. The next prime is 15649889551. The reversal of 15649889537 is 73598894651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15350218816 + 299670721 = 123896^2 + 17311^2 .

It is a cyclic number.

It is not a de Polignac number, because 15649889537 - 2⁶ = 15649889473 is a prime.

It is not a weakly prime, because it can be changed into another prime (15643889537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7824944768 + 7824944769.

It is an arithmetic number, because the mean of its divisors is an integer number (7824944769).

Almost surely, 2^15649889537 is an apocalyptic number.

It is an amenable number.

15649889537 is a deficient number, since it is larger than the sum of its proper divisors (1).

15649889537 is an equidigital number, since it uses as much as digits as its factorization.

15649889537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65318400, while the sum is 65.

The spelling of 15649889537 in words is "fifteen billion, six hundred forty-nine million, eight hundred eighty-nine thousand, five hundred thirty-seven".