81642306023422 has 8 divisors (see below), whose sum is σ = 123002945639496. Its totient is φ = 40641324143592.

The previous prime is 81642306023363. The next prime is 81642306023459. The reversal of 81642306023422 is 22432060324618.

It is a happy number.

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

It is a super-2 number, since 2×81642306023422² (a number of 29 digits) contains 22 as substring.

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, 89914433493 + ... + 89914434400.

It is an arithmetic number, because the mean of its divisors is an integer number (15375368204937).

Almost surely, 2^{81642306023422} is an apocalyptic number.

81642306023422 is a deficient number, since it is larger than the sum of its proper divisors (41360639616074).

81642306023422 is a wasteful number, since it uses less digits than its factorization.

81642306023422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179828868122.

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 81642306023422 in words is "eighty-one trillion, six hundred forty-two billion, three hundred six million, twenty-three thousand, four hundred twenty-two".