81842738494 has 8 divisors (see below), whose sum is σ = 133924481208. Its totient is φ = 37201244760.

The previous prime is 81842738491. The next prime is 81842738503. The reversal of 81842738494 is 49483724818.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81842738491) 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, 1860062217 + ... + 1860062260.

It is an arithmetic number, because the mean of its divisors is an integer number (16740560151).

Almost surely, 2^81842738494 is an apocalyptic number.

81842738494 is a deficient number, since it is larger than the sum of its proper divisors (52081742714).

81842738494 is a wasteful number, since it uses less digits than its factorization.

81842738494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720124490.

The product of its digits is 12386304, while the sum is 58.

The spelling of 81842738494 in words is "eighty-one billion, eight hundred forty-two million, seven hundred thirty-eight thousand, four hundred ninety-four".