81678592331 has 8 divisors (see below), whose sum is σ = 96358155264. Its totient is φ = 67751827560.

The previous prime is 81678592291. The next prime is 81678592367. The reversal of 81678592331 is 13329587618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81678592331 - 2¹⁸ = 81678330187 is a prime.

It is a super-2 number, since 2×81678592331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81678591331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188199305 + ... + 188199738.

It is an arithmetic number, because the mean of its divisors is an integer number (12044769408).

Almost surely, 2^81678592331 is an apocalyptic number.

81678592331 is a deficient number, since it is larger than the sum of its proper divisors (14679562933).

81678592331 is a wasteful number, since it uses less digits than its factorization.

81678592331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376399081.

The product of its digits is 2177280, while the sum is 53.

The spelling of 81678592331 in words is "eighty-one billion, six hundred seventy-eight million, five hundred ninety-two thousand, three hundred thirty-one".