81568612742 has 8 divisors (see below), whose sum is σ = 122629112136. Its totient is φ = 40692242032.

The previous prime is 81568612721. The next prime is 81568612751. The reversal of 81568612742 is 24721686518.

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, 46031063 + ... + 46032834.

It is an arithmetic number, because the mean of its divisors is an integer number (15328639017).

Almost surely, 2^81568612742 is an apocalyptic number.

81568612742 is a deficient number, since it is larger than the sum of its proper divisors (41060499394).

81568612742 is a wasteful number, since it uses less digits than its factorization.

81568612742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92064342.

The product of its digits is 1290240, while the sum is 50.

The spelling of 81568612742 in words is "eighty-one billion, five hundred sixty-eight million, six hundred twelve thousand, seven hundred forty-two".