81204401235 has 16 divisors (see below), whose sum is σ = 131188472064. Its totient is φ = 42888537312.

The previous prime is 81204401209. The next prime is 81204401297. The reversal of 81204401235 is 53210440218.

It is not a de Polignac number, because 81204401235 - 2⁶ = 81204401171 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26278197 + ... + 26281286.

It is an arithmetic number, because the mean of its divisors is an integer number (8199279504).

Almost surely, 2^81204401235 is an apocalyptic number.

81204401235 is a deficient number, since it is larger than the sum of its proper divisors (49984070829).

81204401235 is a wasteful number, since it uses less digits than its factorization.

81204401235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52559594.

The product of its (nonzero) digits is 7680, while the sum is 30.

The spelling of 81204401235 in words is "eighty-one billion, two hundred four million, four hundred one thousand, two hundred thirty-five".