181690018512 has 40 divisors (see below), whose sum is σ = 469477707456. Its totient is φ = 60548910336.

The previous prime is 181690018487. The next prime is 181690018541. The reversal of 181690018512 is 215810096181.

It is a super-2 number, since 2×181690018512² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246388 + ... + 651219.

Almost surely, 2^181690018512 is an apocalyptic number.

181690018512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181690018512 is an abundant number, since it is smaller than the sum of its proper divisors (287787688944).

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

181690018512 is a wasteful number, since it uses less digits than its factorization.

181690018512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901835 (or 901829 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 42.

The spelling of 181690018512 in words is "one hundred eighty-one billion, six hundred ninety million, eighteen thousand, five hundred twelve".