667605525297840 has 120 divisors (see below), whose sum is σ = 2242061214383328. Its totient is φ = 178026605568000.

The previous prime is 667605525297833. The next prime is 667605525297859. The reversal of 667605525297840 is 48792525506766.

667605525297840 is a `hidden beast` number, since 6 + 6 + 7 + 6 + 0 + 5 + 52 + 529 + 7 + 8 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80843472 + ... + 88717968.

Almost surely, 2^{667605525297840} is an apocalyptic number.

667605525297840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667605525297840 is an abundant number, since it is smaller than the sum of its proper divisors (1574455689085488).

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

667605525297840 is a wasteful number, since it uses less digits than its factorization.

667605525297840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7992267 (or 7992258 counting only the distinct ones).

The product of its (nonzero) digits is 1524096000, while the sum is 72.

The spelling of 667605525297840 in words is "six hundred sixty-seven trillion, six hundred five billion, five hundred twenty-five million, two hundred ninety-seven thousand, eight hundred forty".