22501666 has 16 divisors (see below), whose sum is σ = 37327968. Its totient is φ = 10087200.

The previous prime is 22501657. The next prime is 22501669. The reversal of 22501666 is 66610522.

It is not an unprimeable number, because it can be changed into a prime (22501669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5400 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (2332998).

Almost surely, 2^22501666 is an apocalyptic number.

22501666 is a deficient number, since it is larger than the sum of its proper divisors (14826302).

22501666 is a wasteful number, since it uses less digits than its factorization.

22501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14097.

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

The square root of 22501666 is about 4743.5920988213. The cubic root of 22501666 is about 282.3177763413.

It can be divided in two parts, 2250 and 1666, that added together give a triangular number (3916 = T₈₈).

The spelling of 22501666 in words is "twenty-two million, five hundred one thousand, six hundred sixty-six".