81677779041 has 16 divisors (see below), whose sum is σ = 110792908800. Its totient is φ = 53514121680.

The previous prime is 81677778997. The next prime is 81677779061. The reversal of 81677779041 is 14097777618.

It is not a de Polignac number, because 81677779041 - 2⁶ = 81677778977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81677779061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811141 + ... + 906258.

It is an arithmetic number, because the mean of its divisors is an integer number (6924556800).

Almost surely, 2^81677779041 is an apocalyptic number.

It is an amenable number.

81677779041 is a deficient number, since it is larger than the sum of its proper divisors (29115129759).

81677779041 is a wasteful number, since it uses less digits than its factorization.

81677779041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717676.

The product of its (nonzero) digits is 4148928, while the sum is 57.

The spelling of 81677779041 in words is "eighty-one billion, six hundred seventy-seven million, seven hundred seventy-nine thousand, forty-one".