15664120315 has 24 divisors (see below), whose sum is σ = 20322283968. Its totient is φ = 11582144640.

The previous prime is 15664120313. The next prime is 15664120387. The reversal of 15664120315 is 51302146651.

It is not a de Polignac number, because 15664120315 - 2¹ = 15664120313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15664120313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31827 + ... + 179836.

It is an arithmetic number, because the mean of its divisors is an integer number (846761832).

Almost surely, 2^15664120315 is an apocalyptic number.

15664120315 is a deficient number, since it is larger than the sum of its proper divisors (4658163653).

15664120315 is a wasteful number, since it uses less digits than its factorization.

15664120315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211747 (or 211728 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 15664120315 its reverse (51302146651), we get a palindrome (66966266966).

The spelling of 15664120315 in words is "fifteen billion, six hundred sixty-four million, one hundred twenty thousand, three hundred fifteen".