195851621522 has 6 divisors (see below), whose sum is σ = 293778371079. Its totient is φ = 97925497830.

The previous prime is 195851621509. The next prime is 195851621527. The reversal of 195851621522 is 225126158591.

It can be written as a sum of positive squares in only one way, i.e., 97925810761 + 97925810761 = 312931^2 + 312931^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=312931.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195851621527) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 469397 + ... + 782327.

Almost surely, 2^195851621522 is an apocalyptic number.

195851621522 is a deficient number, since it is larger than the sum of its proper divisors (97926749557).

195851621522 is an frugal number, since it uses more digits than its factorization.

195851621522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625864 (or 312933 counting only the distinct ones).

The product of its digits is 432000, while the sum is 47.

The spelling of 195851621522 in words is "one hundred ninety-five billion, eight hundred fifty-one million, six hundred twenty-one thousand, five hundred twenty-two".