81935514989567 has 16 divisors (see below), whose sum is σ = 82275772231968. Its totient is φ = 81595629573120.

The previous prime is 81935514989557. The next prime is 81935514989579. The reversal of 81935514989567 is 76598941553918.

It is a cyclic number.

It is not a de Polignac number, because 81935514989567 - 2¹⁶ = 81935514924031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81935514989491 and 81935514989500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81935514989557) 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, 5295378743 + ... + 5295394215.

It is an arithmetic number, because the mean of its divisors is an integer number (5142235764498).

Almost surely, 2^{81935514989567} is an apocalyptic number.

81935514989567 is a deficient number, since it is larger than the sum of its proper divisors (340257242401).

81935514989567 is a wasteful number, since it uses less digits than its factorization.

81935514989567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26090.

The product of its digits is 2939328000, while the sum is 80.

The spelling of 81935514989567 in words is "eighty-one trillion, nine hundred thirty-five billion, five hundred fourteen million, nine hundred eighty-nine thousand, five hundred sixty-seven".