645445236513 has 24 divisors (see below), whose sum is σ = 1081076323264. Its totient is φ = 335296225440.

The previous prime is 645445236503. The next prime is 645445236529. The reversal of 645445236513 is 315632544546.

It is not a de Polignac number, because 645445236513 - 2²² = 645441042209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645445236503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127003606 + ... + 127008687.

Almost surely, 2^645445236513 is an apocalyptic number.

It is an amenable number.

645445236513 is a deficient number, since it is larger than the sum of its proper divisors (435631086751).

645445236513 is a wasteful number, since it uses less digits than its factorization.

645445236513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254012325 (or 254012314 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 48.

The spelling of 645445236513 in words is "six hundred forty-five billion, four hundred forty-five million, two hundred thirty-six thousand, five hundred thirteen".