66400977 has 32 divisors (see below), whose sum is σ = 98058240. Its totient is φ = 39821760.

The previous prime is 66400973. The next prime is 66400993. The reversal of 66400977 is 77900466.

It is not a de Polignac number, because 66400977 - 2² = 66400973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66400973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78724 + ... + 79562.

It is an arithmetic number, because the mean of its divisors is an integer number (3064320).

Almost surely, 2^66400977 is an apocalyptic number.

It is an amenable number.

66400977 is a deficient number, since it is larger than the sum of its proper divisors (31657263).

66400977 is a wasteful number, since it uses less digits than its factorization.

66400977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 66400977 is about 8148.6794635695. The cubic root of 66400977 is about 404.9407564615.

The spelling of 66400977 in words is "sixty-six million, four hundred thousand, nine hundred seventy-seven".