180161657 has 8 divisors (see below), whose sum is σ = 194134920. Its totient is φ = 166204800.

The previous prime is 180161647. The next prime is 180161671. The reversal of 180161657 is 756161081.

It can be written as a sum of positive squares in 4 ways, for example, as 24810361 + 155351296 = 4981^2 + 12464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 180161657 - 2¹² = 180157561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180161617) 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, 28157 + ... + 33957.

It is an arithmetic number, because the mean of its divisors is an integer number (24266865).

Almost surely, 2^180161657 is an apocalyptic number.

It is an amenable number.

180161657 is a deficient number, since it is larger than the sum of its proper divisors (13973263).

180161657 is a wasteful number, since it uses less digits than its factorization.

180161657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8203.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 180161657 is about 13422.4311136247. The cubic root of 180161657 is about 564.7905945988.

The spelling of 180161657 in words is "one hundred eighty million, one hundred sixty-one thousand, six hundred fifty-seven".