64190588261 has 2 divisors, whose sum is σ = 64190588262. Its totient is φ = 64190588260.

The previous prime is 64190588257. The next prime is 64190588291. The reversal of 64190588261 is 16288509146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48287865025 + 15902723236 = 219745^2 + 126106^2 .

It is a cyclic number.

It is not a de Polignac number, because 64190588261 - 2² = 64190588257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64190588221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32095294130 + 32095294131.

It is an arithmetic number, because the mean of its divisors is an integer number (32095294131).

Almost surely, 2^64190588261 is an apocalyptic number.

It is an amenable number.

64190588261 is a deficient number, since it is larger than the sum of its proper divisors (1).

64190588261 is an equidigital number, since it uses as much as digits as its factorization.

64190588261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 64190588261 in words is "sixty-four billion, one hundred ninety million, five hundred eighty-eight thousand, two hundred sixty-one".