645400143424 has 63 divisors (see below), whose sum is σ = 1291894909347. Its totient is φ = 319907564544.

The previous prime is 645400143383. The next prime is 645400143473. The reversal of 645400143424 is 424341004546.

The square root of 645400143424 is 803368.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 284054889024 + 361345254400 = 532968^2 + 601120^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 880490962 + ... + 880491694.

Almost surely, 2^645400143424 is an apocalyptic number.

645400143424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

645400143424 is the 803368-th square number.

It is an amenable number.

645400143424 is an abundant number, since it is smaller than the sum of its proper divisors (646494765923).

645400143424 is an frugal number, since it uses more digits than its factorization.

645400143424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 37.

The spelling of 645400143424 in words is "six hundred forty-five billion, four hundred million, one hundred forty-three thousand, four hundred twenty-four".