66100217055040 has 56 divisors (see below), whose sum is σ = 179887019277312. Its totient is φ = 22662931560960.

The previous prime is 66100217055023. The next prime is 66100217055073. The reversal of 66100217055040 is 4055071200166.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14754510496 + ... + 14754514975.

Almost surely, 2^{66100217055040} is an apocalyptic number.

It is an amenable number.

66100217055040 is an abundant number, since it is smaller than the sum of its proper divisors (113786802222272).

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

66100217055040 is a wasteful number, since it uses less digits than its factorization.

66100217055040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29509025495 (or 29509025485 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 66100217055040 in words is "sixty-six trillion, one hundred billion, two hundred seventeen million, fifty-five thousand, forty".