66747715885620 has 216 divisors, whose sum is σ = 256935363860448. Its totient is φ = 13869655228800.

The previous prime is 66747715885567. The next prime is 66747715885691. The reversal of 66747715885620 is 2658851774766.

66747715885620 is a `hidden beast` number, since 6 + 6 + 7 + 4 + 7 + 7 + 1 + 58 + 8 + 562 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 343892446 + ... + 344086485.

It is an arithmetic number, because the mean of its divisors is an integer number (1189515573428).

Almost surely, 2^{66747715885620} is an apocalyptic number.

66747715885620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66747715885620 is an abundant number, since it is smaller than the sum of its proper divisors (190187647974828).

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

66747715885620 is a wasteful number, since it uses less digits than its factorization.

66747715885620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687978971 (or 687978959 counting only the distinct ones).

The product of its (nonzero) digits is 948326400, while the sum is 72.

The spelling of 66747715885620 in words is "sixty-six trillion, seven hundred forty-seven billion, seven hundred fifteen million, eight hundred eighty-five thousand, six hundred twenty".