15645625647 has 16 divisors (see below), whose sum is σ = 21239823360. Its totient is φ = 10242182592.

The previous prime is 15645625603. The next prime is 15645625649. The reversal of 15645625647 is 74652654651.

It is not a de Polignac number, because 15645625647 - 2¹⁰ = 15645624623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15645625647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15645625649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107647 + ... + 207072.

It is an arithmetic number, because the mean of its divisors is an integer number (1327488960).

Almost surely, 2^15645625647 is an apocalyptic number.

15645625647 is a deficient number, since it is larger than the sum of its proper divisors (5594197713).

15645625647 is a wasteful number, since it uses less digits than its factorization.

15645625647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315022.

The product of its digits is 6048000, while the sum is 51.

The spelling of 15645625647 in words is "fifteen billion, six hundred forty-five million, six hundred twenty-five thousand, six hundred forty-seven".