645046660 has 24 divisors (see below), whose sum is σ = 1360275840. Its totient is φ = 256937184.

The previous prime is 645046639. The next prime is 645046663. The reversal of 645046660 is 66640546.

It is not an unprimeable number, because it can be changed into a prime (645046663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62694 + ... + 72253.

It is an arithmetic number, because the mean of its divisors is an integer number (56678160).

Almost surely, 2^645046660 is an apocalyptic number.

It is an amenable number.

645046660 is an abundant number, since it is smaller than the sum of its proper divisors (715229180).

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

645046660 is a wasteful number, since it uses less digits than its factorization.

645046660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135195 (or 135193 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 645046660 is about 25397.7687996406. The cubic root of 645046660 is about 864.0330937970.

The spelling of 645046660 in words is "six hundred forty-five million, forty-six thousand, six hundred sixty".