1156405266 has 12 divisors (see below), whose sum is σ = 2505544782. Its totient is φ = 385468416.

The previous prime is 1156405259. The next prime is 1156405273. The reversal of 1156405266 is 6625046511.

1156405266 is a `hidden beast` number, since 1 + 1 + 5 + 640 + 5 + 2 + 6 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (1156405259) and next prime (1156405273).

It can be written as a sum of positive squares in only one way, i.e., 984139641 + 172265625 = 31371^2 + 13125^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1156405266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32122351 + ... + 32122386.

Almost surely, 2^1156405266 is an apocalyptic number.

1156405266 is an abundant number, since it is smaller than the sum of its proper divisors (1349139516).

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

1156405266 is a wasteful number, since it uses less digits than its factorization.

1156405266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64244745 (or 64244742 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1156405266 is about 34005.9592718688. The cubic root of 1156405266 is about 1049.6310921715.

The spelling of 1156405266 in words is "one billion, one hundred fifty-six million, four hundred five thousand, two hundred sixty-six".