645576513 has 8 divisors (see below), whose sum is σ = 911402208. Its totient is φ = 405067584.

The previous prime is 645576493. The next prime is 645576521. The reversal of 645576513 is 315675546.

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

It is not a de Polignac number, because 645576513 - 2⁸ = 645576257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645576553) 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, 6329131 + ... + 6329232.

It is an arithmetic number, because the mean of its divisors is an integer number (113925276).

Almost surely, 2^645576513 is an apocalyptic number.

It is an amenable number.

645576513 is a deficient number, since it is larger than the sum of its proper divisors (265825695).

645576513 is a wasteful number, since it uses less digits than its factorization.

645576513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12658383.

The product of its digits is 378000, while the sum is 42.

The square root of 645576513 is about 25408.1977519068. The cubic root of 645576513 is about 864.2696065234.

The spelling of 645576513 in words is "six hundred forty-five million, five hundred seventy-six thousand, five hundred thirteen".