180109991057 has 2 divisors, whose sum is σ = 180109991058. Its totient is φ = 180109991056.

The previous prime is 180109991053. The next prime is 180109991081. The reversal of 180109991057 is 750199901081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178853713921 + 1256277136 = 422911^2 + 35444^2 .

It is a cyclic number.

It is not a de Polignac number, because 180109991057 - 2² = 180109991053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 180109990996 and 180109991014.

It is not a weakly prime, because it can be changed into another prime (180109991053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90054995528 + 90054995529.

It is an arithmetic number, because the mean of its divisors is an integer number (90054995529).

Almost surely, 2^180109991057 is an apocalyptic number.

It is an amenable number.

180109991057 is a deficient number, since it is larger than the sum of its proper divisors (1).

180109991057 is an equidigital number, since it uses as much as digits as its factorization.

180109991057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 50.

The spelling of 180109991057 in words is "one hundred eighty billion, one hundred nine million, nine hundred ninety-one thousand, fifty-seven".