858319661 has 16 divisors (see below), whose sum is σ = 935784960. Its totient is φ = 784261440.

The previous prime is 858319607. The next prime is 858319667. The reversal of 858319661 is 166913858.

It is a cyclic number.

It is not a de Polignac number, because 858319661 - 2⁶ = 858319597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858319667) 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, 184415 + ... + 189011.

It is an arithmetic number, because the mean of its divisors is an integer number (58486560).

Almost surely, 2^858319661 is an apocalyptic number.

It is an amenable number.

858319661 is a deficient number, since it is larger than the sum of its proper divisors (77465299).

858319661 is a wasteful number, since it uses less digits than its factorization.

858319661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4964.

The product of its digits is 311040, while the sum is 47.

The square root of 858319661 is about 29297.0930469219. The cubic root of 858319661 is about 950.3487771996.

The spelling of 858319661 in words is "eight hundred fifty-eight million, three hundred nineteen thousand, six hundred sixty-one".