81748084957 has 16 divisors (see below), whose sum is σ = 103440886272. Its totient is φ = 62749059120.

The previous prime is 81748084939. The next prime is 81748084963. The reversal of 81748084957 is 75948084718.

It is not a de Polignac number, because 81748084957 - 2³⁵ = 47388346589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81748084895 and 81748084904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81748084927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7917703 + ... + 7928020.

It is an arithmetic number, because the mean of its divisors is an integer number (6465055392).

Almost surely, 2^81748084957 is an apocalyptic number.

It is an amenable number.

81748084957 is a deficient number, since it is larger than the sum of its proper divisors (21692801315).

81748084957 is a wasteful number, since it uses less digits than its factorization.

81748084957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15845808.

The product of its (nonzero) digits is 18063360, while the sum is 61.

The spelling of 81748084957 in words is "eighty-one billion, seven hundred forty-eight million, eighty-four thousand, nine hundred fifty-seven".