677676990681 has 20 divisors (see below), whose sum is σ = 1071881255412. Its totient is φ = 425209091328.

The previous prime is 677676990673. The next prime is 677676990773. The reversal of 677676990681 is 186099676776.

It can be written as a sum of positive squares in 2 ways, for example, as 414729560025 + 262947430656 = 643995^2 + 512784^2 .

It is not a de Polignac number, because 677676990681 - 2³ = 677676990673 is a prime.

It is a super-2 number, since 2×677676990681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (677676990281) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 246068700 + ... + 246071453.

Almost surely, 2^677676990681 is an apocalyptic number.

It is an amenable number.

677676990681 is a deficient number, since it is larger than the sum of its proper divisors (394204264731).

677676990681 is a wasteful number, since it uses less digits than its factorization.

677676990681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492140182 (or 492140173 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 72.

The spelling of 677676990681 in words is "six hundred seventy-seven billion, six hundred seventy-six million, nine hundred ninety thousand, six hundred eighty-one".