180138556 has 24 divisors (see below), whose sum is σ = 340719344. Its totient is φ = 82840320.

The previous prime is 180138547. The next prime is 180138559. The reversal of 180138556 is 655831081.

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 7 ways as a sum of consecutive naturals, for example, 8596 + ... + 20836.

Almost surely, 2^180138556 is an apocalyptic number.

It is an amenable number.

180138556 is a deficient number, since it is larger than the sum of its proper divisors (160580788).

180138556 is a wasteful number, since it uses less digits than its factorization.

180138556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12541 (or 12539 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 180138556 is about 13421.5705489335. The cubic root of 180138556 is about 564.7664537143.

It can be divided in two parts, 18013 and 8556, that added together give a square (26569 = 163²).

The spelling of 180138556 in words is "one hundred eighty million, one hundred thirty-eight thousand, five hundred fifty-six".