81149465248 has 12 divisors (see below), whose sum is σ = 159763009770. Its totient is φ = 40574732608.

The previous prime is 81149465213. The next prime is 81149465261. The reversal of 81149465248 is 84256494118.

It can be written as a sum of positive squares in only one way, i.e., 46065178384 + 35084286864 = 214628^2 + 187308^2 .

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81149465195 and 81149465204.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1267960363 + ... + 1267960426.

Almost surely, 2^81149465248 is an apocalyptic number.

It is an amenable number.

81149465248 is a deficient number, since it is larger than the sum of its proper divisors (78613544522).

81149465248 is a wasteful number, since it uses less digits than its factorization.

81149465248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535920799 (or 2535920791 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 52.

The spelling of 81149465248 in words is "eighty-one billion, one hundred forty-nine million, four hundred sixty-five thousand, two hundred forty-eight".