66553449966720 has 128 divisors (see below), whose sum is σ = 235710135360000. Its totient is φ = 17747586653184.

The previous prime is 66553449966671. The next prime is 66553449966737. The reversal of 66553449966720 is 2766994435566.

66553449966720 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 3 + 4 + 499 + 66 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

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 15 ways as a sum of consecutive naturals, for example, 1925719120 + ... + 1925753679.

It is an arithmetic number, because the mean of its divisors is an integer number (1841485432500).

Almost surely, 2^{66553449966720} is an apocalyptic number.

66553449966720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66553449966720 is an abundant number, since it is smaller than the sum of its proper divisors (169156685393280).

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

66553449966720 is a wasteful number, since it uses less digits than its factorization.

66553449966720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851472827 (or 3851472809 counting only the distinct ones).

The product of its (nonzero) digits is 1763596800, while the sum is 72.

The spelling of 66553449966720 in words is "sixty-six trillion, five hundred fifty-three billion, four hundred forty-nine million, nine hundred sixty-six thousand, seven hundred twenty".