81754492193 has 8 divisors (see below), whose sum is σ = 89888977920. Its totient is φ = 73737049680.

The previous prime is 81754492189. The next prime is 81754492229. The reversal of 81754492193 is 39129445718.

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

It is a cyclic number.

It is not a de Polignac number, because 81754492193 - 2² = 81754492189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81754492103) 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, 29259338 + ... + 29262131.

It is an arithmetic number, because the mean of its divisors is an integer number (11236122240).

Almost surely, 2^81754492193 is an apocalyptic number.

It is an amenable number.

81754492193 is a deficient number, since it is larger than the sum of its proper divisors (8134485727).

81754492193 is a wasteful number, since it uses less digits than its factorization.

81754492193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58521607.

The product of its digits is 2177280, while the sum is 53.

The spelling of 81754492193 in words is "eighty-one billion, seven hundred fifty-four million, four hundred ninety-two thousand, one hundred ninety-three".