66877901 has 2 divisors, whose sum is σ = 66877902. Its totient is φ = 66877900.

The previous prime is 66877897. The next prime is 66877913. The reversal of 66877901 is 10977866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62425801 + 4452100 = 7901^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 66877901 - 2² = 66877897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66877991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33438950 + 33438951.

It is an arithmetic number, because the mean of its divisors is an integer number (33438951).

Almost surely, 2^66877901 is an apocalyptic number.

It is an amenable number.

66877901 is a deficient number, since it is larger than the sum of its proper divisors (1).

66877901 is an equidigital number, since it uses as much as digits as its factorization.

66877901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 66877901 is about 8177.8909872901. The cubic root of 66877901 is about 405.9079381481.

The spelling of 66877901 in words is "sixty-six million, eight hundred seventy-seven thousand, nine hundred one".