16557377025 has 24 divisors (see below), whose sum is σ = 31285559104. Its totient is φ = 7569086400.

The previous prime is 16557376993. The next prime is 16557377033. The reversal of 16557377025 is 52077375561.

It is not a de Polignac number, because 16557377025 - 2⁵ = 16557376993 is a prime.

It is a Duffinian number.

It is a Curzon 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, 15768406 + ... + 15769455.

Almost surely, 2^16557377025 is an apocalyptic number.

16557377025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16557377025 is a deficient number, since it is larger than the sum of its proper divisors (14728182079).

16557377025 is a wasteful number, since it uses less digits than its factorization.

16557377025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31537881 (or 31537876 counting only the distinct ones).

The product of its (nonzero) digits is 1543500, while the sum is 48.

The spelling of 16557377025 in words is "sixteen billion, five hundred fifty-seven million, three hundred seventy-seven thousand, twenty-five".