65767021 has 2 divisors, whose sum is σ = 65767022. Its totient is φ = 65767020.

The previous prime is 65767001. The next prime is 65767043. The reversal of 65767021 is 12076756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56700900 + 9066121 = 7530^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 65767021 - 2⁹ = 65766509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65767001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32883510 + 32883511.

It is an arithmetic number, because the mean of its divisors is an integer number (32883511).

Almost surely, 2^65767021 is an apocalyptic number.

It is an amenable number.

65767021 is a deficient number, since it is larger than the sum of its proper divisors (1).

65767021 is an equidigital number, since it uses as much as digits as its factorization.

65767021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 65767021 is about 8109.6868620188. The cubic root of 65767021 is about 403.6479242381.

The spelling of 65767021 in words is "sixty-five million, seven hundred sixty-seven thousand, twenty-one".