645693742954188 has 72 divisors (see below), whose sum is σ = 1632808618977536. Its totient is φ = 215147078143200.

The previous prime is 645693742954177. The next prime is 645693742954199. The reversal of 645693742954188 is 881459247396546.

645693742954188 is a `hidden beast` number, since 6 + 4 + 5 + 6 + 9 + 3 + 7 + 429 + 5 + 4 + 188 = 666.

It is an interprime number because it is at equal distance from previous prime (645693742954177) and next prime (645693742954199).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3717826593 + ... + 3718000263.

Almost surely, 2^{645693742954188} is an apocalyptic number.

It is an amenable number.

645693742954188 is an abundant number, since it is smaller than the sum of its proper divisors (987114876023348).

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

645693742954188 is a wasteful number, since it uses less digits than its factorization.

645693742954188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213475 (or 213470 counting only the distinct ones).

The product of its digits is 12541132800, while the sum is 81.

The spelling of 645693742954188 in words is "six hundred forty-five trillion, six hundred ninety-three billion, seven hundred forty-two million, nine hundred fifty-four thousand, one hundred eighty-eight".