1266746220 has 72 divisors (see below), whose sum is σ = 3899850864. Its totient is φ = 332754048.

The previous prime is 1266746147. The next prime is 1266746227. The reversal of 1266746220 is 226476621.

1266746220 is a `hidden beast` number, since 1 + 26 + 6 + 7 + 4 + 622 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1266746227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40459 + ... + 64578.

Almost surely, 2^1266746220 is an apocalyptic number.

1266746220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266746220 is an abundant number, since it is smaller than the sum of its proper divisors (2633104644).

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

1266746220 is a wasteful number, since it uses less digits than its factorization.

1266746220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105119 (or 105114 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 1266746220 is about 35591.3784504057. The cubic root of 1266746220 is about 1082.0065064759.

The spelling of 1266746220 in words is "one billion, two hundred sixty-six million, seven hundred forty-six thousand, two hundred twenty".