81133804408 has 16 divisors (see below), whose sum is σ = 160132509000. Its totient is φ = 38431802016.

The previous prime is 81133804327. The next prime is 81133804463. The reversal of 81133804408 is 80440833118.

It is a congruent number.

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, 266887363 + ... + 266887666.

Almost surely, 2^81133804408 is an apocalyptic number.

It is an amenable number.

81133804408 is a deficient number, since it is larger than the sum of its proper divisors (78998704592).

81133804408 is a wasteful number, since it uses less digits than its factorization.

81133804408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533775054 (or 533775050 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 81133804408 in words is "eighty-one billion, one hundred thirty-three million, eight hundred four thousand, four hundred eight".