181516005616 has 40 divisors (see below), whose sum is σ = 386419017600. Its totient is φ = 81913686720.

The previous prime is 181516005439. The next prime is 181516005623. The reversal of 181516005616 is 616500615181.

It is a happy number.

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, 3685396 + ... + 3734323.

It is an arithmetic number, because the mean of its divisors is an integer number (9660475440).

Almost surely, 2^181516005616 is an apocalyptic number.

181516005616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181516005616 is an abundant number, since it is smaller than the sum of its proper divisors (204903011984).

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

181516005616 is a wasteful number, since it uses less digits than its factorization.

181516005616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7419877 (or 7419871 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 181516005616 in words is "one hundred eighty-one billion, five hundred sixteen million, five thousand, six hundred sixteen".