668649340152 has 64 divisors (see below), whose sum is σ = 1857427236000. Its totient is φ = 222874958592.

The previous prime is 668649340033. The next prime is 668649340153. The reversal of 668649340152 is 251043946866.

668649340152 is a `hidden beast` number, since 6 + 68 + 6 + 493 + 40 + 1 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668649340153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9918174 + ... + 9985362.

Almost surely, 2^668649340152 is an apocalyptic number.

It is an amenable number.

668649340152 is an abundant number, since it is smaller than the sum of its proper divisors (1188777895848).

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

668649340152 is a wasteful number, since it uses less digits than its factorization.

668649340152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113277 (or 113267 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 668649340152 in words is "six hundred sixty-eight billion, six hundred forty-nine million, three hundred forty thousand, one hundred fifty-two".