81259945954 has 16 divisors (see below), whose sum is σ = 133121784096. Its totient is φ = 36894404800.

The previous prime is 81259945933. The next prime is 81259945973. The reversal of 81259945954 is 45954995218.

It is a junction number, because it is equal to n+sod(n) for n = 81259945892 and 81259945901.

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, 2076892 + ... + 2115655.

It is an arithmetic number, because the mean of its divisors is an integer number (8320111506).

Almost surely, 2^81259945954 is an apocalyptic number.

81259945954 is a deficient number, since it is larger than the sum of its proper divisors (51861838142).

81259945954 is a wasteful number, since it uses less digits than its factorization.

81259945954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193441.

The product of its digits is 23328000, while the sum is 61.

The spelling of 81259945954 in words is "eighty-one billion, two hundred fifty-nine million, nine hundred forty-five thousand, nine hundred fifty-four".