677985874722 has 54 divisors (see below), whose sum is σ = 1590765723027. Its totient is φ = 208597064832.

The previous prime is 677985874703. The next prime is 677985874817. The reversal of 677985874722 is 227478589776.

It is a happy number.

677985874722 is a `hidden beast` number, since 6 + 7 + 79 + 8 + 5 + 87 + 472 + 2 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 349873433001 + 328112441721 = 591501^2 + 572811^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=582231.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 45406554 + ... + 45421482.

Almost surely, 2^677985874722 is an apocalyptic number.

677985874722 is an abundant number, since it is smaller than the sum of its proper divisors (912779848305).

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

677985874722 is an equidigital number, since it uses as much as digits as its factorization.

677985874722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29892 (or 14947 counting only the distinct ones).

The product of its digits is 663828480, while the sum is 72.

Multiplying 677985874722 by its sum of digits (72), we get a square (48814982979984 = 6986772²).

The spelling of 677985874722 in words is "six hundred seventy-seven billion, nine hundred eighty-five million, eight hundred seventy-four thousand, seven hundred twenty-two".