81157692354 has 16 divisors (see below), whose sum is σ = 163156399392. Its totient is φ = 26912395008.

The previous prime is 81157692293. The next prime is 81157692359. The reversal of 81157692354 is 45329675118.

It is a super-2 number, since 2×81157692354² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81157692297 and 81157692306.

It is not an unprimeable number, because it can be changed into a prime (81157692359) 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, 35041024 + ... + 35043339.

It is an arithmetic number, because the mean of its divisors is an integer number (10197274962).

Almost surely, 2^81157692354 is an apocalyptic number.

81157692354 is an abundant number, since it is smaller than the sum of its proper divisors (81998707038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81157692354 is a wasteful number, since it uses less digits than its factorization.

81157692354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70084561.

The product of its digits is 1814400, while the sum is 51.

The spelling of 81157692354 in words is "eighty-one billion, one hundred fifty-seven million, six hundred ninety-two thousand, three hundred fifty-four".