81544088120 has 32 divisors (see below), whose sum is σ = 200153671920. Its totient is φ = 29652395520.

The previous prime is 81544088117. The next prime is 81544088137. The reversal of 81544088120 is 2188044518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92663297 + ... + 92664176.

Almost surely, 2^81544088120 is an apocalyptic number.

It is an amenable number.

81544088120 is an abundant number, since it is smaller than the sum of its proper divisors (118609583800).

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

81544088120 is a wasteful number, since it uses less digits than its factorization.

81544088120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185327495 (or 185327491 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 41.

The spelling of 81544088120 in words is "eighty-one billion, five hundred forty-four million, eighty-eight thousand, one hundred twenty".