645725514 has 16 divisors (see below), whose sum is σ = 1475944128. Its totient is φ = 184492992.

The previous prime is 645725491. The next prime is 645725533. The reversal of 645725514 is 415527546.

It is a super-2 number, since 2×645725514² = 833922878861128392, which contains 22 as substring.

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, 7687167 + ... + 7687250.

It is an arithmetic number, because the mean of its divisors is an integer number (92246508).

Almost surely, 2^645725514 is an apocalyptic number.

645725514 is an abundant number, since it is smaller than the sum of its proper divisors (830218614).

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

645725514 is a wasteful number, since it uses less digits than its factorization.

645725514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15374429.

The product of its digits is 168000, while the sum is 39.

The square root of 645725514 is about 25411.1297269523. The cubic root of 645725514 is about 864.3360934164.

The spelling of 645725514 in words is "six hundred forty-five million, seven hundred twenty-five thousand, five hundred fourteen".