81962568861 has 8 divisors (see below), whose sum is σ = 109289667744. Its totient is φ = 54638591280.

The previous prime is 81962568829. The next prime is 81962568869. The reversal of 81962568861 is 16886526918.

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

It is not a de Polignac number, because 81962568861 - 2⁵ = 81962568829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81962568795 and 81962568804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81962568869) 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, 718350 + ... + 824591.

It is an arithmetic number, because the mean of its divisors is an integer number (13661208468).

Almost surely, 2^81962568861 is an apocalyptic number.

It is an amenable number.

81962568861 is a deficient number, since it is larger than the sum of its proper divisors (27327098883).

81962568861 is a wasteful number, since it uses less digits than its factorization.

81962568861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560651.

The product of its digits is 9953280, while the sum is 60.

The spelling of 81962568861 in words is "eighty-one billion, nine hundred sixty-two million, five hundred sixty-eight thousand, eight hundred sixty-one".