645425550100 has 18 divisors (see below), whose sum is σ = 1400573443934. Its totient is φ = 258170220000.

The previous prime is 645425550071. The next prime is 645425550139. The reversal of 645425550100 is 1055524546.

It can be written as a sum of positive squares in 3 ways, for example, as 153943230736 + 491482319364 = 392356^2 + 701058^2 .

It is a super-2 number, since 2×645425550100² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645425550100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3227127651 + ... + 3227127850.

Almost surely, 2^645425550100 is an apocalyptic number.

It is an amenable number.

645425550100 is an abundant number, since it is smaller than the sum of its proper divisors (755147893834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645425550100 is a wasteful number, since it uses less digits than its factorization.

645425550100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6454255515 (or 6454255508 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 645425550100 in words is "six hundred forty-five billion, four hundred twenty-five million, five hundred fifty thousand, one hundred".