1089858665 has 32 divisors (see below), whose sum is σ = 1516320000. Its totient is φ = 736579584.

The previous prime is 1089858659. The next prime is 1089858673. The reversal of 1089858665 is 5668589801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089858665 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1089858665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 871961 + ... + 873209.

It is an arithmetic number, because the mean of its divisors is an integer number (47385000).

Almost surely, 2^1089858665 is an apocalyptic number.

It is an amenable number.

1089858665 is a deficient number, since it is larger than the sum of its proper divisors (426461335).

1089858665 is a wasteful number, since it uses less digits than its factorization.

1089858665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601.

The product of its (nonzero) digits is 4147200, while the sum is 56.

The square root of 1089858665 is about 33013.0075121913. The cubic root of 1089858665 is about 1029.0979833490.

The spelling of 1089858665 in words is "one billion, eighty-nine million, eight hundred fifty-eight thousand, six hundred sixty-five".