66500977 has 4 divisors (see below), whose sum is σ = 66540916. Its totient is φ = 66461040.

The previous prime is 66500939. The next prime is 66501049. The reversal of 66500977 is 77900566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6964321 + 59536656 = 2639^2 + 7716^2 .

It is a cyclic number.

It is not a de Polignac number, because 66500977 - 2¹⁵ = 66468209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66500377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17358 + ... + 20839.

It is an arithmetic number, because the mean of its divisors is an integer number (16635229).

Almost surely, 2^66500977 is an apocalyptic number.

It is an amenable number.

66500977 is a deficient number, since it is larger than the sum of its proper divisors (39939).

66500977 is a wasteful number, since it uses less digits than its factorization.

66500977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39938.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 66500977 is about 8154.8131186435. The cubic root of 66500977 is about 405.1439350211.

The spelling of 66500977 in words is "sixty-six million, five hundred thousand, nine hundred seventy-seven".