16553111531 has 16 divisors (see below), whose sum is σ = 19175032800. Its totient is φ = 14122452480.

The previous prime is 16553111489. The next prime is 16553111551. The reversal of 16553111531 is 13511135561.

It is a cyclic number.

It is not a de Polignac number, because 16553111531 - 2²² = 16548917227 is a prime.

It is a super-2 number, since 2×16553111531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16553111551) 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, 61556 + ... + 192081.

It is an arithmetic number, because the mean of its divisors is an integer number (1198439550).

Almost surely, 2^16553111531 is an apocalyptic number.

16553111531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16553111531 is a deficient number, since it is larger than the sum of its proper divisors (2621921269).

16553111531 is a wasteful number, since it uses less digits than its factorization.

16553111531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254014.

The product of its digits is 6750, while the sum is 32.

The spelling of 16553111531 in words is "sixteen billion, five hundred fifty-three million, one hundred eleven thousand, five hundred thirty-one".