121285566 has 32 divisors (see below), whose sum is σ = 271034400. Its totient is φ = 40201920.

The previous prime is 121285561. The next prime is 121285583. The reversal of 121285566 is 665582121.

121285566 is a `hidden beast` number, since 1 + 2 + 12 + 85 + 566 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 121285566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121285561) 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, 3570 + ... + 15978.

It is an arithmetic number, because the mean of its divisors is an integer number (8469825).

Almost surely, 2^121285566 is an apocalyptic number.

121285566 is an abundant number, since it is smaller than the sum of its proper divisors (149748834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121285566 is a wasteful number, since it uses less digits than its factorization.

121285566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12601 (or 12595 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 121285566 is about 11012.9726232294. The cubic root of 121285566 is about 494.9975390144.

The spelling of 121285566 in words is "one hundred twenty-one million, two hundred eighty-five thousand, five hundred sixty-six".