1266726156 has 12 divisors (see below), whose sum is σ = 2955694392. Its totient is φ = 422242048.

The previous prime is 1266726137. The next prime is 1266726179. The reversal of 1266726156 is 6516276621.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52780245 + ... + 52780268.

It is an arithmetic number, because the mean of its divisors is an integer number (246307866).

Almost surely, 2^1266726156 is an apocalyptic number.

It is an amenable number.

1266726156 is an abundant number, since it is smaller than the sum of its proper divisors (1688968236).

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

1266726156 is a wasteful number, since it uses less digits than its factorization.

1266726156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105560520 (or 105560518 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 1266726156 is about 35591.0965832749. The cubic root of 1266726156 is about 1082.0007938102. Note that the first 3 decimals are identical.

The spelling of 1266726156 in words is "one billion, two hundred sixty-six million, seven hundred twenty-six thousand, one hundred fifty-six".