64662391 has 2 divisors, whose sum is σ = 64662392. Its totient is φ = 64662390.

The previous prime is 64662349. The next prime is 64662419. The reversal of 64662391 is 19326646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64662391 - 2¹⁵ = 64629623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64662391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64662331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32331195 + 32331196.

It is an arithmetic number, because the mean of its divisors is an integer number (32331196).

Almost surely, 2^64662391 is an apocalyptic number.

64662391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64662391 is an equidigital number, since it uses as much as digits as its factorization.

64662391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 37.

The square root of 64662391 is about 8041.2928686872. The cubic root of 64662391 is about 401.3752475665.

The spelling of 64662391 in words is "sixty-four million, six hundred sixty-two thousand, three hundred ninety-one".