81690835832 has 16 divisors (see below), whose sum is σ = 153174007800. Its totient is φ = 40844433760.

The previous prime is 81690835819. The next prime is 81690835841. The reversal of 81690835832 is 23853809618.

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, 326282 + ... + 519462.

Almost surely, 2^81690835832 is an apocalyptic number.

It is an amenable number.

81690835832 is a deficient number, since it is larger than the sum of its proper divisors (71483171968).

81690835832 is a wasteful number, since it uses less digits than its factorization.

81690835832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246046 (or 246042 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 81690835832 in words is "eighty-one billion, six hundred ninety million, eight hundred thirty-five thousand, eight hundred thirty-two".