81174633147 has 12 divisors (see below), whose sum is σ = 123423419080. Its totient is φ = 51268189248.

The previous prime is 81174633107. The next prime is 81174633161. The reversal of 81174633147 is 74133647118.

81174633147 is a `hidden beast` number, since 8 + 1 + 1 + 7 + 4 + 633 + 1 + 4 + 7 = 666.

It is not a de Polignac number, because 81174633147 - 2¹⁴ = 81174616763 is a prime.

It is a super-2 number, since 2×81174633147² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81174633107) 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, 237352558 + ... + 237352899.

Almost surely, 2^81174633147 is an apocalyptic number.

81174633147 is a deficient number, since it is larger than the sum of its proper divisors (42248785933).

81174633147 is a wasteful number, since it uses less digits than its factorization.

81174633147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474705482 (or 474705479 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The spelling of 81174633147 in words is "eighty-one billion, one hundred seventy-four million, six hundred thirty-three thousand, one hundred forty-seven".