1866085057 has 16 divisors (see below), whose sum is σ = 1997100160. Its totient is φ = 1738495872.

The previous prime is 1866085043. The next prime is 1866085079. The reversal of 1866085057 is 7505806681.

It is a cyclic number.

It is not a de Polignac number, because 1866085057 - 2¹⁵ = 1866052289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1866084998 and 1866085016.

It is not an unprimeable number, because it can be changed into a prime (1866085007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515548 + ... + 519154.

It is an arithmetic number, because the mean of its divisors is an integer number (124818760).

Almost surely, 2^1866085057 is an apocalyptic number.

It is an amenable number.

1866085057 is a deficient number, since it is larger than the sum of its proper divisors (131015103).

1866085057 is a wasteful number, since it uses less digits than its factorization.

1866085057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 1866085057 is about 43198.2066410169. The cubic root of 1866085057 is about 1231.1486080301.

The spelling of 1866085057 in words is "one billion, eight hundred sixty-six million, eighty-five thousand, fifty-seven".