1266212185 has 48 divisors (see below), whose sum is σ = 1819483776. Its totient is φ = 842994432.

The previous prime is 1266212177. The next prime is 1266212191. The reversal of 1266212185 is 5812126621.

It is a happy number.

It is not a de Polignac number, because 1266212185 - 2³ = 1266212177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1266212185.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2770477 + ... + 2770933.

It is an arithmetic number, because the mean of its divisors is an integer number (37905912).

Almost surely, 2^1266212185 is an apocalyptic number.

It is an amenable number.

1266212185 is a deficient number, since it is larger than the sum of its proper divisors (553271591).

1266212185 is a wasteful number, since it uses less digits than its factorization.

1266212185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 775 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 1266212185 is about 35583.8753510632. The cubic root of 1266212185 is about 1081.8544342995.

The spelling of 1266212185 in words is "one billion, two hundred sixty-six million, two hundred twelve thousand, one hundred eighty-five".