645620006525 has 36 divisors (see below), whose sum is σ = 881581476960. Its totient is φ = 468684590400.

The previous prime is 645620006503. The next prime is 645620006609. The reversal of 645620006525 is 525600026546.

It is not a de Polignac number, because 645620006525 - 2¹⁰ = 645620005501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1045721 + ... + 1544270.

It is an arithmetic number, because the mean of its divisors is an integer number (24488374360).

Almost surely, 2^645620006525 is an apocalyptic number.

645620006525 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645620006525 is a deficient number, since it is larger than the sum of its proper divisors (235961470435).

645620006525 is a wasteful number, since it uses less digits than its factorization.

645620006525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590086 (or 2590068 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 645620006525 in words is "six hundred forty-five billion, six hundred twenty million, six thousand, five hundred twenty-five".