25201666 has 8 divisors (see below), whose sum is σ = 43202880. Its totient is φ = 10800708.

The previous prime is 25201661. The next prime is 25201681. The reversal of 25201666 is 66610252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (25201661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900046 + ... + 900073.

It is an arithmetic number, because the mean of its divisors is an integer number (5400360).

Almost surely, 2^25201666 is an apocalyptic number.

25201666 is a deficient number, since it is larger than the sum of its proper divisors (18001214).

25201666 is a wasteful number, since it uses less digits than its factorization.

25201666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800128.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 25201666 is about 5020.1260940339. The cubic root of 25201666 is about 293.1859024395.

It can be divided in two parts, 2520 and 1666, that added together give a triangular number (4186 = T₉₁).

The spelling of 25201666 in words is "twenty-five million, two hundred one thousand, six hundred sixty-six".