81392429318 has 8 divisors (see below), whose sum is σ = 122457492840. Its totient is φ = 40573265040.

The previous prime is 81392429309. The next prime is 81392429333.

81392429318 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61473983 + ... + 61475306.

It is an arithmetic number, because the mean of its divisors is an integer number (15307186605).

Almost surely, 2^81392429318 is an apocalyptic number.

81392429318 is a deficient number, since it is larger than the sum of its proper divisors (41065063522).

81392429318 is a wasteful number, since it uses less digits than its factorization.

81392429318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122949622.

The product of its digits is 746496, while the sum is 50.

The spelling of 81392429318 in words is "eighty-one billion, three hundred ninety-two million, four hundred twenty-nine thousand, three hundred eighteen".