81677077626 has 16 divisors (see below), whose sum is σ = 172963223424. Its totient is φ = 25624181184.

The previous prime is 81677077543. The next prime is 81677077627. The reversal of 81677077626 is 62677077618.

It is a super-2 number, since 2×81677077626² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81677077627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400377730 + ... + 400377933.

It is an arithmetic number, because the mean of its divisors is an integer number (10810201464).

Almost surely, 2^81677077626 is an apocalyptic number.

81677077626 is an abundant number, since it is smaller than the sum of its proper divisors (91286145798).

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

81677077626 is a wasteful number, since it uses less digits than its factorization.

81677077626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800755685.

The product of its (nonzero) digits is 8297856, while the sum is 57.

The spelling of 81677077626 in words is "eighty-one billion, six hundred seventy-seven million, seventy-seven thousand, six hundred twenty-six".