77171787270256 has 80 divisors (see below), whose sum is σ = 179876028467200. Its totient is φ = 31332568552704.

The previous prime is 77171787270251. The next prime is 77171787270289. The reversal of 77171787270256 is 65207278717177.

It is a junction number, because it is equal to n+sod(n) for n = 77171787270191 and 77171787270200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77171787270251) 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, 322938625 + ... + 323177503.

It is an arithmetic number, because the mean of its divisors is an integer number (2248450355840).

Almost surely, 2^{77171787270256} is an apocalyptic number.

77171787270256 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

77171787270256 is an abundant number, since it is smaller than the sum of its proper divisors (102704241196944).

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

77171787270256 is a wasteful number, since it uses less digits than its factorization.

77171787270256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390726 (or 390720 counting only the distinct ones).

The product of its (nonzero) digits is 112943040, while the sum is 67.

The spelling of 77171787270256 in words is "seventy-seven trillion, one hundred seventy-one billion, seven hundred eighty-seven million, two hundred seventy thousand, two hundred fifty-six".