1266942155 has 8 divisors (see below), whose sum is σ = 1528291584. Its totient is φ = 1008246400.

The previous prime is 1266942151. The next prime is 1266942163. The reversal of 1266942155 is 5512496621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1266942155 - 2² = 1266942151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266942151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662366 + ... + 664275.

It is an arithmetic number, because the mean of its divisors is an integer number (191036448).

Almost surely, 2^1266942155 is an apocalyptic number.

1266942155 is a deficient number, since it is larger than the sum of its proper divisors (261349429).

1266942155 is a wasteful number, since it uses less digits than its factorization.

1266942155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326837.

The product of its digits is 129600, while the sum is 41.

The square root of 1266942155 is about 35594.1309066537. The cubic root of 1266942155 is about 1082.0622903448.

The spelling of 1266942155 in words is "one billion, two hundred sixty-six million, nine hundred forty-two thousand, one hundred fifty-five".