81136295451 has 12 divisors (see below), whose sum is σ = 117204567480. Its totient is φ = 54087311520.

The previous prime is 81136295431. The next prime is 81136295459. The reversal of 81136295451 is 15459263118.

It is a happy number.

81136295451 is a `hidden beast` number, since 8 + 1 + 13 + 629 + 5 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 81136295451 - 2¹⁴ = 81136279067 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81136295397 and 81136295406.

It is not an unprimeable number, because it can be changed into a prime (81136295459) 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, 147421 + ... + 428958.

It is an arithmetic number, because the mean of its divisors is an integer number (9767047290).

Almost surely, 2^81136295451 is an apocalyptic number.

81136295451 is a deficient number, since it is larger than the sum of its proper divisors (36068272029).

81136295451 is a wasteful number, since it uses less digits than its factorization.

81136295451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592026 (or 592023 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The spelling of 81136295451 in words is "eighty-one billion, one hundred thirty-six million, two hundred ninety-five thousand, four hundred fifty-one".