16231105557 has 12 divisors (see below), whose sum is σ = 23511351084. Its totient is φ = 10790081280.

The previous prime is 16231105549. The next prime is 16231105571. The reversal of 16231105557 is 75550113261.

It is a happy number.

16231105557 is a `hidden beast` number, since 1 + 62 + 31 + 10 + 5 + 557 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8726175396 + 7504930161 = 93414^2 + 86631^2 .

It is not a de Polignac number, because 16231105557 - 2³ = 16231105549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16231105577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2551294 + ... + 2557647.

It is an arithmetic number, because the mean of its divisors is an integer number (1959279257).

Almost surely, 2^16231105557 is an apocalyptic number.

It is an amenable number.

16231105557 is a deficient number, since it is larger than the sum of its proper divisors (7280245527).

16231105557 is a wasteful number, since it uses less digits than its factorization.

16231105557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109300 (or 5109297 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The spelling of 16231105557 in words is "sixteen billion, two hundred thirty-one million, one hundred five thousand, five hundred fifty-seven".