81680446774041 has 8 divisors (see below), whose sum is σ = 108907845352800. Its totient is φ = 54453339688992.

The previous prime is 81680446774037. The next prime is 81680446774049. The reversal of 81680446774041 is 14047764408618.

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

It is not a de Polignac number, because 81680446774041 - 2² = 81680446774037 is a prime.

It is a super-2 number, since 2×81680446774041² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81680446774049) 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, 72218755 + ... + 73341048.

It is an arithmetic number, because the mean of its divisors is an integer number (13613480669100).

Almost surely, 2^{81680446774041} is an apocalyptic number.

It is an amenable number.

81680446774041 is a deficient number, since it is larger than the sum of its proper divisors (27227398578759).

81680446774041 is a wasteful number, since it uses less digits than its factorization.

81680446774041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145746855.

The product of its (nonzero) digits is 28901376, while the sum is 60.

The spelling of 81680446774041 in words is "eighty-one trillion, six hundred eighty billion, four hundred forty-six million, seven hundred seventy-four thousand, forty-one".