66320033977 has 2 divisors, whose sum is σ = 66320033978. Its totient is φ = 66320033976.

The previous prime is 66320033947. The next prime is 66320034013. The reversal of 66320033977 is 77933002366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49807526976 + 16512507001 = 223176^2 + 128501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66320033977 is a prime.

It is not a weakly prime, because it can be changed into another prime (66320033917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33160016988 + 33160016989.

It is an arithmetic number, because the mean of its divisors is an integer number (33160016989).

Almost surely, 2^66320033977 is an apocalyptic number.

It is an amenable number.

66320033977 is a deficient number, since it is larger than the sum of its proper divisors (1).

66320033977 is an equidigital number, since it uses as much as digits as its factorization.

66320033977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 46.

The spelling of 66320033977 in words is "sixty-six billion, three hundred twenty million, thirty-three thousand, nine hundred seventy-seven".