64490761253 has 2 divisors, whose sum is σ = 64490761254. Its totient is φ = 64490761252.

The previous prime is 64490761211. The next prime is 64490761331. The reversal of 64490761253 is 35216709446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35639021089 + 28851740164 = 188783^2 + 169858^2 .

It is a cyclic number.

It is not a de Polignac number, because 64490761253 - 2¹⁸ = 64490499109 is a prime.

It is a super-2 number, since 2×64490761253² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64490761198 and 64490761207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64490761453) 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, 32245380626 + 32245380627.

It is an arithmetic number, because the mean of its divisors is an integer number (32245380627).

Almost surely, 2^64490761253 is an apocalyptic number.

It is an amenable number.

64490761253 is a deficient number, since it is larger than the sum of its proper divisors (1).

64490761253 is an equidigital number, since it uses as much as digits as its factorization.

64490761253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 64490761253 in words is "sixty-four billion, four hundred ninety million, seven hundred sixty-one thousand, two hundred fifty-three".