64887677641 has 2 divisors, whose sum is σ = 64887677642. Its totient is φ = 64887677640.

The previous prime is 64887677639. The next prime is 64887677653. The reversal of 64887677641 is 14677678846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58225690000 + 6661987641 = 241300^2 + 81621^2 .

It is a cyclic number.

It is not a de Polignac number, because 64887677641 - 2¹ = 64887677639 is a prime.

Together with 64887677639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64887677341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32443838820 + 32443838821.

It is an arithmetic number, because the mean of its divisors is an integer number (32443838821).

Almost surely, 2^64887677641 is an apocalyptic number.

It is an amenable number.

64887677641 is a deficient number, since it is larger than the sum of its proper divisors (1).

64887677641 is an equidigital number, since it uses as much as digits as its factorization.

64887677641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75866112, while the sum is 64.

The spelling of 64887677641 in words is "sixty-four billion, eight hundred eighty-seven million, six hundred seventy-seven thousand, six hundred forty-one".