645577265524 has 12 divisors (see below), whose sum is σ = 1157315342148. Its totient is φ = 314915739200.

The previous prime is 645577265491. The next prime is 645577265537. The reversal of 645577265524 is 425562775546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 360120010000 + 285457255524 = 600100^2 + 534282^2 .

It is a super-2 number, since 2×645577265524² (a number of 24 digits) contains 22 as substring.

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, 1968223207 + ... + 1968223534.

It is an arithmetic number, because the mean of its divisors is an integer number (96442945179).

Almost surely, 2^645577265524 is an apocalyptic number.

It is an amenable number.

645577265524 is a deficient number, since it is larger than the sum of its proper divisors (511738076624).

645577265524 is a wasteful number, since it uses less digits than its factorization.

645577265524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936446786 (or 3936446784 counting only the distinct ones).

The product of its digits is 70560000, while the sum is 58.

The spelling of 645577265524 in words is "six hundred forty-five billion, five hundred seventy-seven million, two hundred sixty-five thousand, five hundred twenty-four".