645415566133 has 16 divisors (see below), whose sum is σ = 719086273920. Its totient is φ = 575179948224.

The previous prime is 645415566091. The next prime is 645415566139. The reversal of 645415566133 is 331665514546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645415566133 is a prime.

It is a super-2 number, since 2×645415566133² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645415566139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5408610 + ... + 5526652.

It is an arithmetic number, because the mean of its divisors is an integer number (44942892120).

Almost surely, 2^645415566133 is an apocalyptic number.

It is an amenable number.

645415566133 is a deficient number, since it is larger than the sum of its proper divisors (73670707787).

645415566133 is a wasteful number, since it uses less digits than its factorization.

645415566133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132588.

The product of its digits is 3888000, while the sum is 49.

The spelling of 645415566133 in words is "six hundred forty-five billion, four hundred fifteen million, five hundred sixty-six thousand, one hundred thirty-three".