81746743940475 has 48 divisors (see below), whose sum is σ = 135864374837760. Its totient is φ = 43369696988800.

The previous prime is 81746743940443. The next prime is 81746743940497. The reversal of 81746743940475 is 57404934764718.

It is not a de Polignac number, because 81746743940475 - 2⁵ = 81746743940443 is a prime.

It is a super-2 number, since 2×81746743940475² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14444212 + ... + 19290638.

It is an arithmetic number, because the mean of its divisors is an integer number (2830507809120).

Almost surely, 2^{81746743940475} is an apocalyptic number.

81746743940475 is a deficient number, since it is larger than the sum of its proper divisors (54117630897285).

81746743940475 is a wasteful number, since it uses less digits than its factorization.

81746743940475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4847620 (or 4847615 counting only the distinct ones).

The product of its (nonzero) digits is 568995840, while the sum is 69.

The spelling of 81746743940475 in words is "eighty-one trillion, seven hundred forty-six billion, seven hundred forty-three million, nine hundred forty thousand, four hundred seventy-five".