64490761331 has 2 divisors, whose sum is σ = 64490761332. Its totient is φ = 64490761330.

The previous prime is 64490761253. The next prime is 64490761337. The reversal of 64490761331 is 13316709446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64490761331 - 2³⁴ = 47310892147 is a prime.

It is a super-2 number, since 2×64490761331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64490761337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32245380665 + 32245380666.

It is an arithmetic number, because the mean of its divisors is an integer number (32245380666).

Almost surely, 2^64490761331 is an apocalyptic number.

64490761331 is a deficient number, since it is larger than the sum of its proper divisors (1).

64490761331 is an equidigital number, since it uses as much as digits as its factorization.

64490761331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 64490761331 in words is "sixty-four billion, four hundred ninety million, seven hundred sixty-one thousand, three hundred thirty-one".