64825453681 has 2 divisors, whose sum is σ = 64825453682. Its totient is φ = 64825453680.

The previous prime is 64825453631. The next prime is 64825453687. The reversal of 64825453681 is 18635452846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53749785600 + 11075668081 = 231840^2 + 105241^2 .

It is a cyclic number.

It is not a de Polignac number, because 64825453681 - 2⁹ = 64825453169 is a prime.

It is a super-2 number, since 2×64825453681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64825453687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32412726840 + 32412726841.

It is an arithmetic number, because the mean of its divisors is an integer number (32412726841).

Almost surely, 2^64825453681 is an apocalyptic number.

It is an amenable number.

64825453681 is a deficient number, since it is larger than the sum of its proper divisors (1).

64825453681 is an equidigital number, since it uses as much as digits as its factorization.

64825453681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5529600, while the sum is 52.

The spelling of 64825453681 in words is "sixty-four billion, eight hundred twenty-five million, four hundred fifty-three thousand, six hundred eighty-one".