858865887649 has 32 divisors (see below), whose sum is σ = 1130998901760. Its totient is φ = 631858449600.

The previous prime is 858865887641. The next prime is 858865887661. The reversal of 858865887649 is 946788568858.

It is not a de Polignac number, because 858865887649 - 2³ = 858865887641 is a prime.

It is a super-2 number, since 2×858865887649² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (858865887641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 573147 + ... + 1430464.

It is an arithmetic number, because the mean of its divisors is an integer number (35343715680).

Almost surely, 2^858865887649 is an apocalyptic number.

It is an amenable number.

858865887649 is a deficient number, since it is larger than the sum of its proper divisors (272133014111).

858865887649 is a wasteful number, since it uses less digits than its factorization.

858865887649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003941.

The product of its digits is 7431782400, while the sum is 82.

The spelling of 858865887649 in words is "eight hundred fifty-eight billion, eight hundred sixty-five million, eight hundred eighty-seven thousand, six hundred forty-nine".