81579850434 has 16 divisors (see below), whose sum is σ = 181288556640. Its totient is φ = 27193283460.

The previous prime is 81579850361. The next prime is 81579850493. The reversal of 81579850434 is 43405897518.

81579850434 is a `hidden beast` number, since 8 + 15 + 7 + 98 + 504 + 34 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1510737971 = 81579850434 / (8 + 1 + 5 + 7 + 9 + 8 + 5 + 0 + 4 + 3 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 755368932 + ... + 755369039.

It is an arithmetic number, because the mean of its divisors is an integer number (11330534790).

Almost surely, 2^81579850434 is an apocalyptic number.

81579850434 is an abundant number, since it is smaller than the sum of its proper divisors (99708706206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81579850434 is a wasteful number, since it uses less digits than its factorization.

81579850434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510737982 (or 1510737976 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 81579850434 in words is "eighty-one billion, five hundred seventy-nine million, eight hundred fifty thousand, four hundred thirty-four".