181307504899 has 16 divisors (see below), whose sum is σ = 192531869568. Its totient is φ = 170145626112.

The previous prime is 181307504891. The next prime is 181307505083. The reversal of 181307504899 is 998405703181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 181307504899 - 2³ = 181307504891 is a prime.

It is a super-2 number, since 2×181307504899² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181307504891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28835334 + ... + 28841620.

It is an arithmetic number, because the mean of its divisors is an integer number (12033241848).

Almost surely, 2^181307504899 is an apocalyptic number.

181307504899 is a deficient number, since it is larger than the sum of its proper divisors (11224364669).

181307504899 is a wasteful number, since it uses less digits than its factorization.

181307504899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10974.

The product of its (nonzero) digits is 2177280, while the sum is 55.

It can be divided in two parts, 181307504 and 899, that added together give a triangular number (181308403 = T₁₉₀₄₂).

The spelling of 181307504899 in words is "one hundred eighty-one billion, three hundred seven million, five hundred four thousand, eight hundred ninety-nine".