81797134403 has 4 divisors (see below), whose sum is σ = 86102246760. Its totient is φ = 77492022048.

The previous prime is 81797134399. The next prime is 81797134421. The reversal of 81797134403 is 30443179718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81797134403 - 2² = 81797134399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81797134423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152556150 + ... + 2152556187.

It is an arithmetic number, because the mean of its divisors is an integer number (21525561690).

Almost surely, 2^81797134403 is an apocalyptic number.

81797134403 is a deficient number, since it is larger than the sum of its proper divisors (4305112357).

81797134403 is a wasteful number, since it uses less digits than its factorization.

81797134403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305112356.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 81797134403 in words is "eighty-one billion, seven hundred ninety-seven million, one hundred thirty-four thousand, four hundred three".