81274253475 has 12 divisors (see below), whose sum is σ = 134373432536. Its totient is φ = 43346268480.

The previous prime is 81274253461. The next prime is 81274253483. The reversal of 81274253475 is 57435247218.

It is a happy number.

It is not a de Polignac number, because 81274253475 - 2⁵ = 81274253443 is a prime.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 541828282 + ... + 541828431.

Almost surely, 2^81274253475 is an apocalyptic number.

81274253475 is a deficient number, since it is larger than the sum of its proper divisors (53099179061).

81274253475 is a wasteful number, since it uses less digits than its factorization.

81274253475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083656726 (or 1083656721 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 48.

The spelling of 81274253475 in words is "eighty-one billion, two hundred seventy-four million, two hundred fifty-three thousand, four hundred seventy-five".