64651369 has 2 divisors, whose sum is σ = 64651370. Its totient is φ = 64651368.

The previous prime is 64651339. The next prime is 64651387. The reversal of 64651369 is 96315646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59105344 + 5546025 = 7688^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 64651369 - 2⁷ = 64651241 is a prime.

It is a super-2 number, since 2×64651369² = 8359599027148322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64651339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32325684 + 32325685.

It is an arithmetic number, because the mean of its divisors is an integer number (32325685).

Almost surely, 2^64651369 is an apocalyptic number.

It is an amenable number.

64651369 is a deficient number, since it is larger than the sum of its proper divisors (1).

64651369 is an equidigital number, since it uses as much as digits as its factorization.

64651369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 40.

The square root of 64651369 is about 8040.6075019242. The cubic root of 64651369 is about 401.3524408557.

The spelling of 64651369 in words is "sixty-four million, six hundred fifty-one thousand, three hundred sixty-nine".