66077211172 has 48 divisors (see below), whose sum is σ = 133334691840. Its totient is φ = 28067019552.

The previous prime is 66077211119. The next prime is 66077211191. The reversal of 66077211172 is 27111277066.

It is a happy number.

It is a super-2 number, since 2×66077211172² (a number of 22 digits) contains 22 as substring.

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, 1394079 + ... + 1440697.

It is an arithmetic number, because the mean of its divisors is an integer number (2777806080).

Almost surely, 2^66077211172 is an apocalyptic number.

It is an amenable number.

66077211172 is an abundant number, since it is smaller than the sum of its proper divisors (67257480668).

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

66077211172 is a wasteful number, since it uses less digits than its factorization.

66077211172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47080 (or 47078 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 66077211172 in words is "sixty-six billion, seventy-seven million, two hundred eleven thousand, one hundred seventy-two".