81260162163997 has 2 divisors, whose sum is σ = 81260162163998. Its totient is φ = 81260162163996.

The previous prime is 81260162163937. The next prime is 81260162164121. The reversal of 81260162163997 is 79936126106218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69631114164676 + 11629047999321 = 8344526^2 + 3410139^2 .

It is a cyclic number.

It is not a de Polignac number, because 81260162163997 - 2²⁷ = 81260027946269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81260162163937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40630081081998 + 40630081081999.

It is an arithmetic number, because the mean of its divisors is an integer number (40630081081999).

Almost surely, 2^{81260162163997} is an apocalyptic number.

It is an amenable number.

81260162163997 is a deficient number, since it is larger than the sum of its proper divisors (1).

81260162163997 is an equidigital number, since it uses as much as digits as its factorization.

81260162163997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 81260162163997 in words is "eighty-one trillion, two hundred sixty billion, one hundred sixty-two million, one hundred sixty-three thousand, nine hundred ninety-seven".