15021297664 has 52 divisors (see below), whose sum is σ = 30088852164. Its totient is φ = 7498170368.

The previous prime is 15021297661. The next prime is 15021297667. The reversal of 15021297664 is 46679212051.

It is an interprime number because it is at equal distance from previous prime (15021297661) and next prime (15021297667).

It can be written as a sum of positive squares in 2 ways, for example, as 9093529600 + 5927768064 = 95360^2 + 76992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15021297664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15021297661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2770284 + ... + 2775700.

Almost surely, 2^15021297664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15021297664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15044426082).

15021297664 is an abundant number, since it is smaller than the sum of its proper divisors (15067554500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15021297664 is an frugal number, since it uses more digits than its factorization.

15021297664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6118 (or 6096 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 15021297664 in words is "fifteen billion, twenty-one million, two hundred ninety-seven thousand, six hundred sixty-four".