64562681 has 2 divisors, whose sum is σ = 64562682. Its totient is φ = 64562680.

The previous prime is 64562621. The next prime is 64562683. The reversal of 64562681 is 18626546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62647225 + 1915456 = 7915^2 + 1384^2 .

It is a cyclic number.

It is not a de Polignac number, because 64562681 - 2¹⁰ = 64561657 is a prime.

It is a super-2 number, since 2×64562681² = 8336679555815522, which contains 22 as substring.

Together with 64562683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64562683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32281340 + 32281341.

It is an arithmetic number, because the mean of its divisors is an integer number (32281341).

Almost surely, 2^64562681 is an apocalyptic number.

It is an amenable number.

64562681 is a deficient number, since it is larger than the sum of its proper divisors (1).

64562681 is an equidigital number, since it uses as much as digits as its factorization.

64562681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 64562681 is about 8035.0906030984. The cubic root of 64562681 is about 401.1688333282.

The spelling of 64562681 in words is "sixty-four million, five hundred sixty-two thousand, six hundred eighty-one".