66145513554600 has 96 divisors (see below), whose sum is σ = 205094924424000. Its totient is φ = 17635033085440.

The previous prime is 66145513554587. The next prime is 66145513554649. The reversal of 66145513554600 is 645531554166.

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, 8973165 + ... + 14587964.

It is an arithmetic number, because the mean of its divisors is an integer number (2136405462750).

Almost surely, 2^{66145513554600} is an apocalyptic number.

66145513554600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66145513554600 is an abundant number, since it is smaller than the sum of its proper divisors (138949410869400).

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

66145513554600 is a wasteful number, since it uses less digits than its factorization.

66145513554600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23565827 (or 23565818 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 51.

The spelling of 66145513554600 in words is "sixty-six trillion, one hundred forty-five billion, five hundred thirteen million, five hundred fifty-four thousand, six hundred".