861151266 has 48 divisors (see below), whose sum is σ = 1881426456. Its totient is φ = 284663808.

The previous prime is 861151243. The next prime is 861151267. The reversal of 861151266 is 662151168.

861151266 is a `hidden beast` number, since 86 + 1 + 1 + 512 + 66 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 240095025 + 621056241 = 15495^2 + 24921^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 861151266.

It is not an unprimeable number, because it can be changed into a prime (861151267) 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, 1988586 + ... + 1989018.

Almost surely, 2^861151266 is an apocalyptic number.

861151266 is an abundant number, since it is smaller than the sum of its proper divisors (1020275190).

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

861151266 is a wasteful number, since it uses less digits than its factorization.

861151266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1104 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 861151266 is about 29345.3789547860. The cubic root of 861151266 is about 951.3927000555.

The spelling of 861151266 in words is "eight hundred sixty-one million, one hundred fifty-one thousand, two hundred sixty-six".