645425441015 has 4 divisors (see below), whose sum is σ = 774510529224. Its totient is φ = 516340352808.

The previous prime is 645425441009. The next prime is 645425441029. The reversal of 645425441015 is 510144524546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645425441015 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64542544097 + ... + 64542544106.

It is an arithmetic number, because the mean of its divisors is an integer number (193627632306).

Almost surely, 2^645425441015 is an apocalyptic number.

645425441015 is a deficient number, since it is larger than the sum of its proper divisors (129085088209).

645425441015 is a wasteful number, since it uses less digits than its factorization.

645425441015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129085088208.

The product of its (nonzero) digits is 384000, while the sum is 41.

The spelling of 645425441015 in words is "six hundred forty-five billion, four hundred twenty-five million, four hundred forty-one thousand, fifteen".