66121277976 has 48 divisors (see below), whose sum is σ = 192853730160. Its totient is φ = 20345008320.

The previous prime is 66121277953. The next prime is 66121278007. The reversal of 66121277976 is 67977212166.

66121277976 is a `hidden beast` number, since 6 + 612 + 12 + 7 + 7 + 9 + 7 + 6 = 666.

It is a super-3 number, since 3×66121277976³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35320260 + ... + 35322131.

It is an arithmetic number, because the mean of its divisors is an integer number (4017786045).

Almost surely, 2^66121277976 is an apocalyptic number.

It is an amenable number.

66121277976 is an abundant number, since it is smaller than the sum of its proper divisors (126732452184).

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

66121277976 is a wasteful number, since it uses less digits than its factorization.

66121277976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70642416 (or 70642409 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The spelling of 66121277976 in words is "sixty-six billion, one hundred twenty-one million, two hundred seventy-seven thousand, nine hundred seventy-six".