195477124321 has 2 divisors, whose sum is σ = 195477124322. Its totient is φ = 195477124320.

The previous prime is 195477124309. The next prime is 195477124343. The reversal of 195477124321 is 123421774591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139087973025 + 56389151296 = 372945^2 + 237464^2 .

It is an emirp because it is prime and its reverse (123421774591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195477124321 - 2⁵ = 195477124289 is a prime.

It is a super-2 number, since 2×195477124321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (195477164321) 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, 97738562160 + 97738562161.

It is an arithmetic number, because the mean of its divisors is an integer number (97738562161).

Almost surely, 2^195477124321 is an apocalyptic number.

It is an amenable number.

195477124321 is a deficient number, since it is larger than the sum of its proper divisors (1).

195477124321 is an equidigital number, since it uses as much as digits as its factorization.

195477124321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The spelling of 195477124321 in words is "one hundred ninety-five billion, four hundred seventy-seven million, one hundred twenty-four thousand, three hundred twenty-one".