668547144 has 48 divisors (see below), whose sum is σ = 1852765200. Its totient is φ = 217665504.

The previous prime is 668547137. The next prime is 668547157. The reversal of 668547144 is 441745866.

668547144 is a `hidden beast` number, since 6 + 68 + 547 + 1 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 668547144.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104874 + ... + 111065.

It is an arithmetic number, because the mean of its divisors is an integer number (38599275).

Almost surely, 2^668547144 is an apocalyptic number.

It is an amenable number.

668547144 is an abundant number, since it is smaller than the sum of its proper divisors (1184218056).

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

668547144 is a wasteful number, since it uses less digits than its factorization.

668547144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215994 (or 215987 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 668547144 is about 25856.2786185483. The cubic root of 668547144 is about 874.4010677879.

The spelling of 668547144 in words is "six hundred sixty-eight million, five hundred forty-seven thousand, one hundred forty-four".