81475137295 has 24 divisors (see below), whose sum is σ = 105000486192. Its totient is φ = 60481639680.

The previous prime is 81475137287. The next prime is 81475137301. The reversal of 81475137295 is 59273157418.

It is not a de Polignac number, because 81475137295 - 2³ = 81475137287 is a prime.

It is a super-4 number, since 4×81475137295⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333412 + ... + 523558.

It is an arithmetic number, because the mean of its divisors is an integer number (4375020258).

Almost surely, 2^81475137295 is an apocalyptic number.

81475137295 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81475137295 is a deficient number, since it is larger than the sum of its proper divisors (23525348897).

81475137295 is a wasteful number, since it uses less digits than its factorization.

81475137295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190311 (or 190240 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 52.

The spelling of 81475137295 in words is "eighty-one billion, four hundred seventy-five million, one hundred thirty-seven thousand, two hundred ninety-five".