64942579649 has 2 divisors, whose sum is σ = 64942579650. Its totient is φ = 64942579648.

The previous prime is 64942579619. The next prime is 64942579697. The reversal of 64942579649 is 94697524946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59960337424 + 4982242225 = 244868^2 + 70585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64942579649 is a prime.

It is not a weakly prime, because it can be changed into another prime (64942579619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32471289824 + 32471289825.

It is an arithmetic number, because the mean of its divisors is an integer number (32471289825).

Almost surely, 2^64942579649 is an apocalyptic number.

It is an amenable number.

64942579649 is a deficient number, since it is larger than the sum of its proper divisors (1).

64942579649 is an equidigital number, since it uses as much as digits as its factorization.

64942579649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117573120, while the sum is 65.

The spelling of 64942579649 in words is "sixty-four billion, nine hundred forty-two million, five hundred seventy-nine thousand, six hundred forty-nine".