180455981954257 has 2 divisors, whose sum is σ = 180455981954258. Its totient is φ = 180455981954256.

The previous prime is 180455981954233. The next prime is 180455981954291. The reversal of 180455981954257 is 752459189554081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142059914994321 + 38396066959936 = 11918889^2 + 6196456^2 .

It is a cyclic number.

It is not a de Polignac number, because 180455981954257 - 2²³ = 180455973565649 is a prime.

It is a super-2 number, since 2×180455981954257² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 180455981954257.

It is not a weakly prime, because it can be changed into another prime (180455981954207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90227990977128 + 90227990977129.

It is an arithmetic number, because the mean of its divisors is an integer number (90227990977129).

Almost surely, 2^{180455981954257} is an apocalyptic number.

It is an amenable number.

180455981954257 is a deficient number, since it is larger than the sum of its proper divisors (1).

180455981954257 is an equidigital number, since it uses as much as digits as its factorization.

180455981954257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760000, while the sum is 73.

The spelling of 180455981954257 in words is "one hundred eighty trillion, four hundred fifty-five billion, nine hundred eighty-one million, nine hundred fifty-four thousand, two hundred fifty-seven".