16577881551 has 128 divisors (see below), whose sum is σ = 32599480320. Its totient is φ = 8060774400.

The previous prime is 16577881543. The next prime is 16577881553. The reversal of 16577881551 is 15518877561.

16577881551 is a `hidden beast` number, since 1 + 6 + 5 + 7 + 7 + 8 + 81 + 551 = 666.

It is not a de Polignac number, because 16577881551 - 2³ = 16577881543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16577881553) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6961381 + ... + 6963761.

It is an arithmetic number, because the mean of its divisors is an integer number (254683440).

Almost surely, 2^16577881551 is an apocalyptic number.

16577881551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16577881551 is a deficient number, since it is larger than the sum of its proper divisors (16021598769).

16577881551 is a wasteful number, since it uses less digits than its factorization.

16577881551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622 (or 2616 counting only the distinct ones).

The product of its digits is 2352000, while the sum is 54.

The spelling of 16577881551 in words is "sixteen billion, five hundred seventy-seven million, eight hundred eighty-one thousand, five hundred fifty-one".