195180662921 has 2 divisors, whose sum is σ = 195180662922. Its totient is φ = 195180662920.

The previous prime is 195180662899. The next prime is 195180662933. The reversal of 195180662921 is 129266081591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110885670025 + 84294992896 = 332995^2 + 290336^2 .

It is a cyclic number.

It is not a de Polignac number, because 195180662921 - 2¹⁸ = 195180400777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195180662921.

It is not a weakly prime, because it can be changed into another prime (195180062921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97590331460 + 97590331461.

It is an arithmetic number, because the mean of its divisors is an integer number (97590331461).

Almost surely, 2^195180662921 is an apocalyptic number.

It is an amenable number.

195180662921 is a deficient number, since it is larger than the sum of its proper divisors (1).

195180662921 is an equidigital number, since it uses as much as digits as its factorization.

195180662921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 50.

The spelling of 195180662921 in words is "one hundred ninety-five billion, one hundred eighty million, six hundred sixty-two thousand, nine hundred twenty-one".