645674414680 has 32 divisors (see below), whose sum is σ = 1453035122640. Its totient is φ = 258222176640.

The previous prime is 645674414659. The next prime is 645674414699. The reversal of 645674414680 is 86414476546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1266966 + ... + 1701925.

Almost surely, 2^645674414680 is an apocalyptic number.

It is an amenable number.

645674414680 is an abundant number, since it is smaller than the sum of its proper divisors (807360707960).

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

645674414680 is a wasteful number, since it uses less digits than its factorization.

645674414680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974339 (or 2974335 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 55.

The spelling of 645674414680 in words is "six hundred forty-five billion, six hundred seventy-four million, four hundred fourteen thousand, six hundred eighty".