81735385604 has 12 divisors (see below), whose sum is σ = 143054508828. Its totient is φ = 40862668800.

The previous prime is 81735385597. The next prime is 81735385609. The reversal of 81735385604 is 40658353718.

It can be written as a sum of positive squares in 2 ways, for example, as 27739568704 + 53995816900 = 166552^2 + 232370^2 .

It is not an unprimeable number, because it can be changed into a prime (81735385609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219277 + ... + 1284564.

It is an arithmetic number, because the mean of its divisors is an integer number (11921209069).

Almost surely, 2^81735385604 is an apocalyptic number.

It is an amenable number.

81735385604 is a deficient number, since it is larger than the sum of its proper divisors (61319123224).

81735385604 is a wasteful number, since it uses less digits than its factorization.

81735385604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512006 (or 2512004 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 81735385604 in words is "eighty-one billion, seven hundred thirty-five million, three hundred eighty-five thousand, six hundred four".