645646554654 has 16 divisors (see below), whose sum is σ = 1291861237392. Its totient is φ = 215120830208.

The previous prime is 645646554617. The next prime is 645646554661. The reversal of 645646554654 is 456455646546.

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, 23657229 + ... + 23684504.

It is an arithmetic number, because the mean of its divisors is an integer number (80741327337).

Almost surely, 2^645646554654 is an apocalyptic number.

645646554654 is an abundant number, since it is smaller than the sum of its proper divisors (646214682738).

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

645646554654 is a wasteful number, since it uses less digits than its factorization.

645646554654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47344011.

The product of its digits is 207360000, while the sum is 60.

The spelling of 645646554654 in words is "six hundred forty-five billion, six hundred forty-six million, five hundred fifty-four thousand, six hundred fifty-four".