16557377055 has 16 divisors (see below), whose sum is σ = 26497563264. Its totient is φ = 8828681120.

The previous prime is 16557377051. The next prime is 16557377063. The reversal of 16557377055 is 55077375561.

It is a happy number.

It is not a de Polignac number, because 16557377055 - 2² = 16557377051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16557376989 and 16557377007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557377051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47289 + ... + 188018.

It is an arithmetic number, because the mean of its divisors is an integer number (1656097704).

Almost surely, 2^16557377055 is an apocalyptic number.

16557377055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16557377055 is a deficient number, since it is larger than the sum of its proper divisors (9940186209).

16557377055 is a wasteful number, since it uses less digits than its factorization.

16557377055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240006.

The product of its (nonzero) digits is 3858750, while the sum is 51.

The spelling of 16557377055 in words is "sixteen billion, five hundred fifty-seven million, three hundred seventy-seven thousand, fifty-five".