866272761 has 12 divisors (see below), whose sum is σ = 1258517988. Its totient is φ = 574175904.

The previous prime is 866272747. The next prime is 866272801. The reversal of 866272761 is 167272668.

It can be written as a sum of positive squares in 2 ways, for example, as 657614736 + 208658025 = 25644^2 + 14445^2 .

It is not a de Polignac number, because 866272761 - 2⁹ = 866272249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866272721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276630 + ... + 279743.

It is an arithmetic number, because the mean of its divisors is an integer number (104876499).

Almost surely, 2^866272761 is an apocalyptic number.

It is an amenable number.

866272761 is a deficient number, since it is larger than the sum of its proper divisors (392245227).

866272761 is a wasteful number, since it uses less digits than its factorization.

866272761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556552 (or 556549 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 866272761 is about 29432.5119723071. The cubic root of 866272761 is about 953.2750349726.

The spelling of 866272761 in words is "eight hundred sixty-six million, two hundred seventy-two thousand, seven hundred sixty-one".