16776776988 has 36 divisors (see below), whose sum is σ = 42621087600. Its totient is φ = 5564154816.

The previous prime is 16776776981. The next prime is 16776776993. The reversal of 16776776988 is 88967767761.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×16776776988² (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 (16776776981) 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, 1163745 + ... + 1178072.

It is an arithmetic number, because the mean of its divisors is an integer number (1183919100).

Almost surely, 2^16776776988 is an apocalyptic number.

16776776988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16776776988 is an abundant number, since it is smaller than the sum of its proper divisors (25844310612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16776776988 is a wasteful number, since it uses less digits than its factorization.

16776776988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342026 (or 2342021 counting only the distinct ones).

The product of its digits is 298722816, while the sum is 72.

The spelling of 16776776988 in words is "sixteen billion, seven hundred seventy-six million, seven hundred seventy-six thousand, nine hundred eighty-eight".