645906515370 has 32 divisors (see below), whose sum is σ = 1550266534080. Its totient is φ = 172231637760.

The previous prime is 645906515279. The next prime is 645906515389. The reversal of 645906515370 is 73515609546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103855 + ... + 1141314.

It is an arithmetic number, because the mean of its divisors is an integer number (48445829190).

Almost surely, 2^645906515370 is an apocalyptic number.

645906515370 is an abundant number, since it is smaller than the sum of its proper divisors (904360018710).

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

645906515370 is a wasteful number, since it uses less digits than its factorization.

645906515370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262470.

The product of its (nonzero) digits is 3402000, while the sum is 51.

The spelling of 645906515370 in words is "six hundred forty-five billion, nine hundred six million, five hundred fifteen thousand, three hundred seventy".