180138557 has 4 divisors (see below), whose sum is σ = 180168576. Its totient is φ = 180108540.

The previous prime is 180138547. The next prime is 180138559. The reversal of 180138557 is 755831081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 180138557 - 2¹⁶ = 180073021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180138557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180138559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573 + ... + 19154.

It is an arithmetic number, because the mean of its divisors is an integer number (45042144).

Almost surely, 2^180138557 is an apocalyptic number.

It is an amenable number.

180138557 is a deficient number, since it is larger than the sum of its proper divisors (30019).

180138557 is an equidigital number, since it uses as much as digits as its factorization.

180138557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30018.

The product of its (nonzero) digits is 33600, while the sum is 38.

The square root of 180138557 is about 13421.5705861870. The cubic root of 180138557 is about 564.7664547594.

The spelling of 180138557 in words is "one hundred eighty million, one hundred thirty-eight thousand, five hundred fifty-seven".