81201415697 has 2 divisors, whose sum is σ = 81201415698. Its totient is φ = 81201415696.

The previous prime is 81201415663. The next prime is 81201415703. The reversal of 81201415697 is 79651410218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76642600336 + 4558815361 = 276844^2 + 67519^2 .

It is a cyclic number.

It is not a de Polignac number, because 81201415697 - 2⁸ = 81201415441 is a prime.

It is a super-2 number, since 2×81201415697² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81201475697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40600707848 + 40600707849.

It is an arithmetic number, because the mean of its divisors is an integer number (40600707849).

Almost surely, 2^81201415697 is an apocalyptic number.

It is an amenable number.

81201415697 is a deficient number, since it is larger than the sum of its proper divisors (1).

81201415697 is an equidigital number, since it uses as much as digits as its factorization.

81201415697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 81201415697 in words is "eighty-one billion, two hundred one million, four hundred fifteen thousand, six hundred ninety-seven".