81199876593 has 16 divisors (see below), whose sum is σ = 125056495296. Its totient is φ = 46317219840.

The previous prime is 81199876531. The next prime is 81199876601. The reversal of 81199876593 is 39567899118.

It is not a de Polignac number, because 81199876593 - 2¹³ = 81199868401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81199877593) 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, 72370096 + ... + 72371217.

It is an arithmetic number, because the mean of its divisors is an integer number (7816030956).

Almost surely, 2^81199876593 is an apocalyptic number.

It is an amenable number.

81199876593 is a deficient number, since it is larger than the sum of its proper divisors (43856618703).

81199876593 is a wasteful number, since it uses less digits than its factorization.

81199876593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144741344.

The product of its digits is 29393280, while the sum is 66.

The spelling of 81199876593 in words is "eighty-one billion, one hundred ninety-nine million, eight hundred seventy-six thousand, five hundred ninety-three".