12550066566 has 16 divisors (see below), whose sum is σ = 25150440000. Its totient is φ = 4174971048.

The previous prime is 12550066549. The next prime is 12550066583. The reversal of 12550066566 is 66566005521.

It is an interprime number because it is at equal distance from previous prime (12550066549) and next prime (12550066583).

It is a super-2 number, since 2×12550066566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2092876 + ... + 2098863.

It is an arithmetic number, because the mean of its divisors is an integer number (1571902500).

Almost surely, 2^12550066566 is an apocalyptic number.

12550066566 is an abundant number, since it is smaller than the sum of its proper divisors (12600373434).

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

12550066566 is a wasteful number, since it uses less digits than its factorization.

12550066566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192243.

The product of its (nonzero) digits is 324000, while the sum is 42.

The spelling of 12550066566 in words is "twelve billion, five hundred fifty million, sixty-six thousand, five hundred sixty-six".