81434058572 has 12 divisors (see below), whose sum is σ = 144313522080. Its totient is φ = 40201623696.

The previous prime is 81434058523. The next prime is 81434058599. The reversal of 81434058572 is 27585043418.

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, 128851043 + ... + 128851674.

It is an arithmetic number, because the mean of its divisors is an integer number (12026126840).

Almost surely, 2^81434058572 is an apocalyptic number.

It is an amenable number.

81434058572 is a deficient number, since it is larger than the sum of its proper divisors (62879463508).

81434058572 is a wasteful number, since it uses less digits than its factorization.

81434058572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257702800 (or 257702798 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 47.

The spelling of 81434058572 in words is "eighty-one billion, four hundred thirty-four million, fifty-eight thousand, five hundred seventy-two".