66557217140 has 48 divisors (see below), whose sum is σ = 148044117312. Its totient is φ = 25047998976.

The previous prime is 66557217091. The next prime is 66557217161. The reversal of 66557217140 is 4171275566.

It is a super-2 number, since 2×66557217140² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66557217091 and 66557217100.

It is a congruent number.

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, 974387 + ... + 1040453.

It is an arithmetic number, because the mean of its divisors is an integer number (3084252444).

Almost surely, 2^66557217140 is an apocalyptic number.

It is an amenable number.

66557217140 is an abundant number, since it is smaller than the sum of its proper divisors (81486900172).

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

66557217140 is a wasteful number, since it uses less digits than its factorization.

66557217140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69056 (or 69054 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 66557217140 in words is "sixty-six billion, five hundred fifty-seven million, two hundred seventeen thousand, one hundred forty".