64377581 has 2 divisors, whose sum is σ = 64377582. Its totient is φ = 64377580.

The previous prime is 64377571. The next prime is 64377601. The reversal of 64377581 is 18577346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53421481 + 10956100 = 7309^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 64377581 - 2¹⁴ = 64361197 is a prime.

It is a super-2 number, since 2×64377581² = 8288945870823122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64377541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32188790 + 32188791.

It is an arithmetic number, because the mean of its divisors is an integer number (32188791).

Almost surely, 2^64377581 is an apocalyptic number.

It is an amenable number.

64377581 is a deficient number, since it is larger than the sum of its proper divisors (1).

64377581 is an equidigital number, since it uses as much as digits as its factorization.

64377581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 41.

The square root of 64377581 is about 8023.5641083000. The cubic root of 64377581 is about 400.7850851784.

The spelling of 64377581 in words is "sixty-four million, three hundred seventy-seven thousand, five hundred eighty-one".