16501156551 has 12 divisors (see below), whose sum is σ = 26001822600. Its totient is φ = 10000700880.

The previous prime is 16501156549. The next prime is 16501156559. The reversal of 16501156551 is 15565110561.

It is a happy number.

16501156551 is a `hidden beast` number, since 1 + 6 + 50 + 1 + 1 + 56 + 551 = 666.

It is not a de Polignac number, because 16501156551 - 2¹ = 16501156549 is a prime.

It is a super-2 number, since 2×16501156551² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16501156559) 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, 83339076 + ... + 83339273.

It is an arithmetic number, because the mean of its divisors is an integer number (2166818550).

Almost surely, 2^16501156551 is an apocalyptic number.

16501156551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16501156551 is a deficient number, since it is larger than the sum of its proper divisors (9500666049).

16501156551 is a wasteful number, since it uses less digits than its factorization.

16501156551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166678366 (or 166678363 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 16501156551 in words is "sixteen billion, five hundred one million, one hundred fifty-six thousand, five hundred fifty-one".