81996157695 has 32 divisors (see below), whose sum is σ = 137981159424. Its totient is φ = 41522083200.

The previous prime is 81996157687. The next prime is 81996157697. The reversal of 81996157695 is 59675169918.

It is not a de Polignac number, because 81996157695 - 2³ = 81996157687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81996157697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1638901 + ... + 1688190.

It is an arithmetic number, because the mean of its divisors is an integer number (4311911232).

Almost surely, 2^81996157695 is an apocalyptic number.

81996157695 is a deficient number, since it is larger than the sum of its proper divisors (55985001729).

81996157695 is a wasteful number, since it uses less digits than its factorization.

81996157695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327183.

The product of its digits is 36741600, while the sum is 66.

The spelling of 81996157695 in words is "eighty-one billion, nine hundred ninety-six million, one hundred fifty-seven thousand, six hundred ninety-five".