66641072660 has 24 divisors (see below), whose sum is σ = 140531811840. Its totient is φ = 26544893984.

The previous prime is 66641072623. The next prime is 66641072669. The reversal of 66641072660 is 6627014666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66641072669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6966044 + ... + 6975603.

It is an arithmetic number, because the mean of its divisors is an integer number (5855492160).

Almost surely, 2^66641072660 is an apocalyptic number.

It is an amenable number.

66641072660 is an abundant number, since it is smaller than the sum of its proper divisors (73890739180).

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

66641072660 is a wasteful number, since it uses less digits than its factorization.

66641072660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13941895 (or 13941893 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 66641072660 in words is "sixty-six billion, six hundred forty-one million, seventy-two thousand, six hundred sixty".