64961265653 has 2 divisors, whose sum is σ = 64961265654. Its totient is φ = 64961265652.

The previous prime is 64961265587. The next prime is 64961265673. The reversal of 64961265653 is 35656216946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51122566609 + 13838699044 = 226103^2 + 117638^2 .

It is a cyclic number.

It is not a de Polignac number, because 64961265653 - 2¹⁰ = 64961264629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64961265595 and 64961265604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64961265673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32480632826 + 32480632827.

It is an arithmetic number, because the mean of its divisors is an integer number (32480632827).

Almost surely, 2^64961265653 is an apocalyptic number.

It is an amenable number.

64961265653 is a deficient number, since it is larger than the sum of its proper divisors (1).

64961265653 is an equidigital number, since it uses as much as digits as its factorization.

64961265653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 53.

The spelling of 64961265653 in words is "sixty-four billion, nine hundred sixty-one million, two hundred sixty-five thousand, six hundred fifty-three".