25720166 has 8 divisors (see below), whose sum is σ = 38724480. Its totient is φ = 12812008.

The previous prime is 25720159. The next prime is 25720169. The reversal of 25720166 is 66102752.

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

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25720169) 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, 23366 + ... + 24441.

It is an arithmetic number, because the mean of its divisors is an integer number (4840560).

Almost surely, 2^25720166 is an apocalyptic number.

25720166 is a deficient number, since it is larger than the sum of its proper divisors (13004314).

25720166 is a wasteful number, since it uses less digits than its factorization.

25720166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48078.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 25720166 is about 5071.5052992184. The cubic root of 25720166 is about 295.1829412052.

The spelling of 25720166 in words is "twenty-five million, seven hundred twenty thousand, one hundred sixty-six".