81633574830 has 32 divisors (see below), whose sum is σ = 207445320864. Its totient is φ = 20488426496.

The previous prime is 81633574817. The next prime is 81633574861. The reversal of 81633574830 is 3847533618.

It is a self number, because there is not a number n which added to its sum of digits gives 81633574830.

It is a congruent number.

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, 80032407 + ... + 80033426.

It is an arithmetic number, because the mean of its divisors is an integer number (6482666277).

Almost surely, 2^81633574830 is an apocalyptic number.

81633574830 is an abundant number, since it is smaller than the sum of its proper divisors (125811746034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81633574830 is a wasteful number, since it uses less digits than its factorization.

81633574830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160065860.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 81633574830 in words is "eighty-one billion, six hundred thirty-three million, five hundred seventy-four thousand, eight hundred thirty".