866605545 has 24 divisors (see below), whose sum is σ = 1617664776. Its totient is φ = 426636288.

The previous prime is 866605529. The next prime is 866605559. The reversal of 866605545 is 545506668.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 127449 + 866478096 = 357^2 + 29436^2 .

It is not a de Polignac number, because 866605545 - 2⁴ = 866605529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 866605545.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 740104 + ... + 741273.

It is an arithmetic number, because the mean of its divisors is an integer number (67402699).

Almost surely, 2^866605545 is an apocalyptic number.

It is an amenable number.

866605545 is a deficient number, since it is larger than the sum of its proper divisors (751059231).

866605545 is a wasteful number, since it uses less digits than its factorization.

866605545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481401 (or 1481398 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The square root of 866605545 is about 29438.1647695640. The cubic root of 866605545 is about 953.3970881640.

The spelling of 866605545 in words is "eight hundred sixty-six million, six hundred five thousand, five hundred forty-five".