199108956625 has 16 divisors (see below), whose sum is σ = 249775510608. Its totient is φ = 158461824000.

The previous prime is 199108956623. The next prime is 199108956653. The reversal of 199108956625 is 526659801991.

It can be written as a sum of positive squares in 8 ways, for example, as 110753177616 + 88355779009 = 332796^2 + 297247^2 .

It is not a de Polignac number, because 199108956625 - 2¹ = 199108956623 is a prime.

It is a super-2 number, since 2×199108956625² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199108956623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4102486 + ... + 4150735.

It is an arithmetic number, because the mean of its divisors is an integer number (15610969413).

Almost surely, 2^199108956625 is an apocalyptic number.

It is an amenable number.

199108956625 is a deficient number, since it is larger than the sum of its proper divisors (50666553983).

199108956625 is an equidigital number, since it uses as much as digits as its factorization.

199108956625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253429 (or 8253419 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 61.

The spelling of 199108956625 in words is "one hundred ninety-nine billion, one hundred eight million, nine hundred fifty-six thousand, six hundred twenty-five".