81680592354 has 16 divisors (see below), whose sum is σ = 164887926048. Its totient is φ = 26972407232.

The previous prime is 81680592319. The next prime is 81680592377. The reversal of 81680592354 is 45329508618.

It is a super-2 number, since 2×81680592354² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81680592297 and 81680592306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63613527 + ... + 63614810.

It is an arithmetic number, because the mean of its divisors is an integer number (10305495378).

Almost surely, 2^81680592354 is an apocalyptic number.

81680592354 is an abundant number, since it is smaller than the sum of its proper divisors (83207333694).

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

81680592354 is a wasteful number, since it uses less digits than its factorization.

81680592354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127228449.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 81680592354 in words is "eighty-one billion, six hundred eighty million, five hundred ninety-two thousand, three hundred fifty-four".