64612112195681 has 2 divisors, whose sum is σ = 64612112195682. Its totient is φ = 64612112195680.

The previous prime is 64612112195597. The next prime is 64612112195731. The reversal of 64612112195681 is 18659121121646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52776723328081 + 11835388867600 = 7264759^2 + 3440260^2 .

It is a cyclic number.

It is not a de Polignac number, because 64612112195681 - 2¹⁴ = 64612112179297 is a prime.

It is a super-2 number, since 2×64612112195681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64612112197681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32306056097840 + 32306056097841.

It is an arithmetic number, because the mean of its divisors is an integer number (32306056097841).

Almost surely, 2^{64612112195681} is an apocalyptic number.

It is an amenable number.

64612112195681 is a deficient number, since it is larger than the sum of its proper divisors (1).

64612112195681 is an equidigital number, since it uses as much as digits as its factorization.

64612112195681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 53.

The spelling of 64612112195681 in words is "sixty-four trillion, six hundred twelve billion, one hundred twelve million, one hundred ninety-five thousand, six hundred eighty-one".