65923721 has 2 divisors, whose sum is σ = 65923722. Its totient is φ = 65923720.

The previous prime is 65923717. The next prime is 65923733. The reversal of 65923721 is 12732956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43494025 + 22429696 = 6595^2 + 4736^2 .

It is a cyclic number.

It is not a de Polignac number, because 65923721 - 2² = 65923717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65923421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32961860 + 32961861.

It is an arithmetic number, because the mean of its divisors is an integer number (32961861).

Almost surely, 2^65923721 is an apocalyptic number.

It is an amenable number.

65923721 is a deficient number, since it is larger than the sum of its proper divisors (1).

65923721 is an equidigital number, since it uses as much as digits as its factorization.

65923721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 35.

The square root of 65923721 is about 8119.3423994804. The cubic root of 65923721 is about 403.9682542941.

The spelling of 65923721 in words is "sixty-five million, nine hundred twenty-three thousand, seven hundred twenty-one".