195108607521 has 45 divisors (see below), whose sum is σ = 309718944579. Its totient is φ = 122378682816.

The previous prime is 195108607489. The next prime is 195108607541. The reversal of 195108607521 is 125706801591.

The square root of 195108607521 is 441711.

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

195108607521 is a `hidden beast` number, since 1 + 9 + 5 + 10 + 8 + 607 + 5 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 151901165025 + 43207442496 = 389745^2 + 207864^2 .

It is not a de Polignac number, because 195108607521 - 2⁵ = 195108607489 is a prime.

It is a super-3 number, since 3×195108607521³ (a number of 35 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195108607541) 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 in 44 ways as a sum of consecutive naturals, for example, 67580340 + ... + 67583226.

Almost surely, 2^195108607521 is an apocalyptic number.

195108607521 is the 441711-st square number.

195108607521 is the 220856-th centered octagonal number.

It is an amenable number.

195108607521 is a deficient number, since it is larger than the sum of its proper divisors (114610337058).

195108607521 is an frugal number, since it uses more digits than its factorization.

195108607521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820 (or 2907 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 195108607521 in words is "one hundred ninety-five billion, one hundred eight million, six hundred seven thousand, five hundred twenty-one".