66167851278 has 48 divisors (see below), whose sum is σ = 134164413936. Its totient is φ = 21753607680.

The previous prime is 66167851249. The next prime is 66167851297. The reversal of 66167851278 is 87215876166.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35554068 + ... + 35555928.

It is an arithmetic number, because the mean of its divisors is an integer number (2795091957).

Almost surely, 2^66167851278 is an apocalyptic number.

66167851278 is an abundant number, since it is smaller than the sum of its proper divisors (67996562658).

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

66167851278 is a wasteful number, since it uses less digits than its factorization.

66167851278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437 (or 2208 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 57.

The spelling of 66167851278 in words is "sixty-six billion, one hundred sixty-seven million, eight hundred fifty-one thousand, two hundred seventy-eight".