16539225978 has 48 divisors (see below), whose sum is σ = 36374244480. Its totient is φ = 5009780160.

The previous prime is 16539225961. The next prime is 16539226003. The reversal of 16539225978 is 87952293561.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3198351 + ... + 3203517.

It is an arithmetic number, because the mean of its divisors is an integer number (757796760).

Almost surely, 2^16539225978 is an apocalyptic number.

16539225978 is an abundant number, since it is smaller than the sum of its proper divisors (19835018502).

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

16539225978 is a wasteful number, since it uses less digits than its factorization.

16539225978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9603 (or 9592 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 57.

The spelling of 16539225978 in words is "sixteen billion, five hundred thirty-nine million, two hundred twenty-five thousand, nine hundred seventy-eight".