674518906681 has 3 divisors (see below), whose sum is σ = 674519727973. Its totient is φ = 674518085390.

The previous prime is 674518906667. The next prime is 674518906693. The reversal of 674518906681 is 186609815476.

It is a happy number.

The square root of 674518906681 is 821291.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 674518906681 - 2²⁷ = 674384688953 is a prime.

It is a super-2 number, since 2×674518906681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674518906181) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 410646 + ... + 1231936.

Almost surely, 2^674518906681 is an apocalyptic number.

674518906681 is the 821291-st square number.

674518906681 is the 410646-th centered octagonal number.

It is an amenable number.

674518906681 is a deficient number, since it is larger than the sum of its proper divisors (821292).

674518906681 is an frugal number, since it uses more digits than its factorization.

674518906681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642582 (or 821291 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 674518906681 in words is "six hundred seventy-four billion, five hundred eighteen million, nine hundred six thousand, six hundred eighty-one".