81556445035 has 12 divisors (see below), whose sum is σ = 105975121392. Its totient is φ = 60226297248.

The previous prime is 81556445029. The next prime is 81556445051. The reversal of 81556445035 is 53054465518.

It is not a de Polignac number, because 81556445035 - 2²⁷ = 81422227307 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48257407 + ... + 48259096.

It is an arithmetic number, because the mean of its divisors is an integer number (8831260116).

Almost surely, 2^81556445035 is an apocalyptic number.

81556445035 is a deficient number, since it is larger than the sum of its proper divisors (24418676357).

81556445035 is a wasteful number, since it uses less digits than its factorization.

81556445035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96516534 (or 96516521 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 46.

The spelling of 81556445035 in words is "eighty-one billion, five hundred fifty-six million, four hundred forty-five thousand, thirty-five".