81930775295 has 16 divisors (see below), whose sum is σ = 101402955648. Its totient is φ = 63514886400.

The previous prime is 81930775271. The next prime is 81930775327. The reversal of 81930775295 is 59257703918.

It is not a de Polignac number, because 81930775295 - 2¹⁸ = 81930513151 is a prime.

It is a super-3 number, since 3×81930775295³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81930775295.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1702214 + ... + 1749683.

It is an arithmetic number, because the mean of its divisors is an integer number (6337684728).

Almost surely, 2^81930775295 is an apocalyptic number.

81930775295 is a deficient number, since it is larger than the sum of its proper divisors (19472180353).

81930775295 is a wasteful number, since it uses less digits than its factorization.

81930775295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452050.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 81930775295 in words is "eighty-one billion, nine hundred thirty million, seven hundred seventy-five thousand, two hundred ninety-five".