645425705 has 8 divisors (see below), whose sum is σ = 774863232. Its totient is φ = 516105648.

The previous prime is 645425699. The next prime is 645425717. The reversal of 645425705 is 507524546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645425705 - 2²⁶ = 578316841 is a prime.

It is a Duffinian 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, 16787 + ... + 39656.

It is an arithmetic number, because the mean of its divisors is an integer number (96857904).

Almost surely, 2^645425705 is an apocalyptic number.

It is an amenable number.

645425705 is a deficient number, since it is larger than the sum of its proper divisors (129437527).

645425705 is a wasteful number, since it uses less digits than its factorization.

645425705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58735.

The product of its (nonzero) digits is 168000, while the sum is 38.

The square root of 645425705 is about 25405.2298749687. The cubic root of 645425705 is about 864.2023028971.

The spelling of 645425705 in words is "six hundred forty-five million, four hundred twenty-five thousand, seven hundred five".