645854554888 has 32 divisors (see below), whose sum is σ = 1220940979200. Its totient is φ = 320274640512.

The previous prime is 645854554861. The next prime is 645854554897. The reversal of 645854554888 is 888455458546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920293 + ... + 1462411.

It is an arithmetic number, because the mean of its divisors is an integer number (38154405600).

Almost surely, 2^645854554888 is an apocalyptic number.

It is an amenable number.

645854554888 is a deficient number, since it is larger than the sum of its proper divisors (575086424312).

645854554888 is a wasteful number, since it uses less digits than its factorization.

645854554888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543349 (or 543345 counting only the distinct ones).

The product of its digits is 983040000, while the sum is 70.

The spelling of 645854554888 in words is "six hundred forty-five billion, eight hundred fifty-four million, five hundred fifty-four thousand, eight hundred eighty-eight".