199661725 has 12 divisors (see below), whose sum is σ = 247861120. Its totient is φ = 159548400.

The previous prime is 199661717. The next prime is 199661741. The reversal of 199661725 is 527166991.

It is not a de Polignac number, because 199661725 - 2³ = 199661717 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20746 + ... + 28804.

Almost surely, 2^199661725 is an apocalyptic number.

It is an amenable number.

199661725 is a deficient number, since it is larger than the sum of its proper divisors (48199395).

199661725 is an equidigital number, since it uses as much as digits as its factorization.

199661725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060 (or 9055 counting only the distinct ones).

The product of its digits is 204120, while the sum is 46.

The square root of 199661725 is about 14130.1707349911. The cubic root of 199661725 is about 584.4736542146.

The spelling of 199661725 in words is "one hundred ninety-nine million, six hundred sixty-one thousand, seven hundred twenty-five".