81132237297 has 12 divisors (see below), whose sum is σ = 119112174324. Its totient is φ = 53201466720.

The previous prime is 81132237293. The next prime is 81132237301. The reversal of 81132237297 is 79273223118.

81132237297 is a `hidden beast` number, since 8 + 1 + 1 + 322 + 37 + 297 = 666.

It is an interprime number because it is at equal distance from previous prime (81132237293) and next prime (81132237301).

It can be written as a sum of positive squares in 2 ways, for example, as 34822918881 + 46309318416 = 186609^2 + 215196^2 .

It is not a de Polignac number, because 81132237297 - 2² = 81132237293 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81132237293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73890378 + ... + 73891475.

It is an arithmetic number, because the mean of its divisors is an integer number (9926014527).

Almost surely, 2^81132237297 is an apocalyptic number.

It is an amenable number.

81132237297 is a deficient number, since it is larger than the sum of its proper divisors (37979937027).

81132237297 is a wasteful number, since it uses less digits than its factorization.

81132237297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147781920 (or 147781917 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 81132237297 in words is "eighty-one billion, one hundred thirty-two million, two hundred thirty-seven thousand, two hundred ninety-seven".