66055221216560 has 40 divisors (see below), whose sum is σ = 156096067853616. Its totient is φ = 25988939493120.

The previous prime is 66055221216557. The next prime is 66055221216581. The reversal of 66055221216560 is 6561212255066.

It is a tau number, because it is divible by the number of its divisors (40).

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, 6767948114 + ... + 6767957873.

Almost surely, 2^{66055221216560} is an apocalyptic number.

It is an amenable number.

66055221216560 is an abundant number, since it is smaller than the sum of its proper divisors (90040846637056).

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

66055221216560 is a wasteful number, since it uses less digits than its factorization.

66055221216560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13535906061 (or 13535906055 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 66055221216560 in words is "sixty-six trillion, fifty-five billion, two hundred twenty-one million, two hundred sixteen thousand, five hundred sixty".