15997218468 has 96 divisors (see below), whose sum is σ = 46616414208. Its totient is φ = 4148064000.

The previous prime is 15997218449. The next prime is 15997218469. The reversal of 15997218468 is 86481279951.

It is not an unprimeable number, because it can be changed into a prime (15997218469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 540921 + ... + 569727.

It is an arithmetic number, because the mean of its divisors is an integer number (485587648).

Almost surely, 2^15997218468 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 15997218468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23308207104).

15997218468 is an abundant number, since it is smaller than the sum of its proper divisors (30619195740).

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

15997218468 is a wasteful number, since it uses less digits than its factorization.

15997218468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29433 (or 29431 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 60.

The spelling of 15997218468 in words is "fifteen billion, nine hundred ninety-seven million, two hundred eighteen thousand, four hundred sixty-eight".