64858966649 has 2 divisors, whose sum is σ = 64858966650. Its totient is φ = 64858966648.

The previous prime is 64858966603. The next prime is 64858966691. The reversal of 64858966649 is 94666985846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61006530025 + 3852436624 = 246995^2 + 62068^2 .

It is a cyclic number.

It is not a de Polignac number, because 64858966649 - 2¹⁶ = 64858901113 is a prime.

It is not a weakly prime, because it can be changed into another prime (64858963649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32429483324 + 32429483325.

It is an arithmetic number, because the mean of its divisors is an integer number (32429483325).

Almost surely, 2^64858966649 is an apocalyptic number.

It is an amenable number.

64858966649 is a deficient number, since it is larger than the sum of its proper divisors (1).

64858966649 is an equidigital number, since it uses as much as digits as its factorization.

64858966649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537477120, while the sum is 71.

The spelling of 64858966649 in words is "sixty-four billion, eight hundred fifty-eight million, nine hundred sixty-six thousand, six hundred forty-nine".