64866709 has 2 divisors, whose sum is σ = 64866710. Its totient is φ = 64866708.

The previous prime is 64866689. The next prime is 64866719. The reversal of 64866709 is 90766846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40640625 + 24226084 = 6375^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 64866709 - 2²¹ = 62769557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64866719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32433354 + 32433355.

It is an arithmetic number, because the mean of its divisors is an integer number (32433355).

Almost surely, 2^64866709 is an apocalyptic number.

It is an amenable number.

64866709 is a deficient number, since it is larger than the sum of its proper divisors (1).

64866709 is an equidigital number, since it uses as much as digits as its factorization.

64866709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 64866709 is about 8053.9871492324. The cubic root of 64866709 is about 401.7975536516.

The spelling of 64866709 in words is "sixty-four million, eight hundred sixty-six thousand, seven hundred nine".