15597321954 has 16 divisors (see below), whose sum is σ = 32037742848. Its totient is φ = 5058590832.

The previous prime is 15597321953. The next prime is 15597322003. The reversal of 15597321954 is 45912379551.

It is a junction number, because it is equal to n+sod(n) for n = 15597321897 and 15597321906.

It is not an unprimeable number, because it can be changed into a prime (15597321953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35128882 + ... + 35129325.

It is an arithmetic number, because the mean of its divisors is an integer number (2002358928).

Almost surely, 2^15597321954 is an apocalyptic number.

15597321954 is an abundant number, since it is smaller than the sum of its proper divisors (16440420894).

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

15597321954 is a wasteful number, since it uses less digits than its factorization.

15597321954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70258249.

The product of its digits is 1701000, while the sum is 51.

The spelling of 15597321954 in words is "fifteen billion, five hundred ninety-seven million, three hundred twenty-one thousand, nine hundred fifty-four".