195550568521 has 27 divisors (see below), whose sum is σ = 250080458733. Its totient is φ = 152350533720.

The previous prime is 195550568509. The next prime is 195550568561. The reversal of 195550568521 is 125865055591.

The square root of 195550568521 is 442211.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 195550568521 - 2⁷ = 195550568393 is a prime.

It is a super-2 number, since 2×195550568521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (195550568561) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 34047376 + ... + 34053118.

Almost surely, 2^195550568521 is an apocalyptic number.

195550568521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

195550568521 is the 442211-st square number.

195550568521 is the 221106-th centered octagonal number.

It is an amenable number.

195550568521 is a deficient number, since it is larger than the sum of its proper divisors (54529890212).

195550568521 is an frugal number, since it uses more digits than its factorization.

195550568521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11522 (or 5761 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 52.

The spelling of 195550568521 in words is "one hundred ninety-five billion, five hundred fifty million, five hundred sixty-eight thousand, five hundred twenty-one".