1266731816 has 16 divisors (see below), whose sum is σ = 2714425440. Its totient is φ = 542885040.

The previous prime is 1266731813. The next prime is 1266731819. The reversal of 1266731816 is 6181376621.

It is an interprime number because it is at equal distance from previous prime (1266731813) and next prime (1266731819).

It is not an unprimeable number, because it can be changed into a prime (1266731813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11310050 + ... + 11310161.

It is an arithmetic number, because the mean of its divisors is an integer number (169651590).

Almost surely, 2^1266731816 is an apocalyptic number.

It is an amenable number.

1266731816 is an abundant number, since it is smaller than the sum of its proper divisors (1447693624).

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

1266731816 is a wasteful number, since it uses less digits than its factorization.

1266731816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22620224 (or 22620220 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 1266731816 is about 35591.1760974543. The cubic root of 1266731816 is about 1082.0024053438.

The spelling of 1266731816 in words is "one billion, two hundred sixty-six million, seven hundred thirty-one thousand, eight hundred sixteen".