64220532991 has 2 divisors, whose sum is σ = 64220532992. Its totient is φ = 64220532990.

The previous prime is 64220532913. The next prime is 64220533009. The reversal of 64220532991 is 19923502246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64220532991 - 2¹⁷ = 64220401919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64220532791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110266495 + 32110266496.

It is an arithmetic number, because the mean of its divisors is an integer number (32110266496).

Almost surely, 2^64220532991 is an apocalyptic number.

64220532991 is a deficient number, since it is larger than the sum of its proper divisors (1).

64220532991 is an equidigital number, since it uses as much as digits as its factorization.

64220532991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 64220532991 in words is "sixty-four billion, two hundred twenty million, five hundred thirty-two thousand, nine hundred ninety-one".