181289180157 has 16 divisors (see below), whose sum is σ = 260766682560. Its totient is φ = 111603844352.

The previous prime is 181289180129. The next prime is 181289180231. The reversal of 181289180157 is 751081982181.

It is a cyclic number.

It is not a de Polignac number, because 181289180157 - 2¹⁰ = 181289179133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181289180357) 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, 33532107 + ... + 33537512.

It is an arithmetic number, because the mean of its divisors is an integer number (16297917660).

Almost surely, 2^181289180157 is an apocalyptic number.

181289180157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

181289180157 is a deficient number, since it is larger than the sum of its proper divisors (79477502403).

181289180157 is a wasteful number, since it uses less digits than its factorization.

181289180157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67069692.

The product of its (nonzero) digits is 322560, while the sum is 51.

The spelling of 181289180157 in words is "one hundred eighty-one billion, two hundred eighty-nine million, one hundred eighty thousand, one hundred fifty-seven".