15604640651 has 4 divisors (see below), whose sum is σ = 16283103312. Its totient is φ = 14926177992.

The previous prime is 15604640609. The next prime is 15604640683.

It is a happy number.

15604640651 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 15604640651 - 2¹⁸ = 15604378507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15604640851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339231296 + ... + 339231341.

It is an arithmetic number, because the mean of its divisors is an integer number (4070775828).

Almost surely, 2^15604640651 is an apocalyptic number.

15604640651 is a deficient number, since it is larger than the sum of its proper divisors (678462661).

15604640651 is an equidigital number, since it uses as much as digits as its factorization.

15604640651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678462660.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 15604640651 in words is "fifteen billion, six hundred four million, six hundred forty thousand, six hundred fifty-one".