81742201797 has 8 divisors (see below), whose sum is σ = 110482610944. Its totient is φ = 53748296928.

The previous prime is 81742201781. The next prime is 81742201829. The reversal of 81742201797 is 79710224718.

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

It is not a de Polignac number, because 81742201797 - 2⁴ = 81742201781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81742201297) 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, 186625813 + ... + 186626250.

It is an arithmetic number, because the mean of its divisors is an integer number (13810326368).

Almost surely, 2^81742201797 is an apocalyptic number.

It is an amenable number.

81742201797 is a deficient number, since it is larger than the sum of its proper divisors (28740409147).

81742201797 is a wasteful number, since it uses less digits than its factorization.

81742201797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373252139.

The product of its (nonzero) digits is 395136, while the sum is 48.

The spelling of 81742201797 in words is "eighty-one billion, seven hundred forty-two million, two hundred one thousand, seven hundred ninety-seven".