858893521979 has 16 divisors (see below), whose sum is σ = 891547572960. Its totient is φ = 826875329280.

The previous prime is 858893521943. The next prime is 858893521987. The reversal of 858893521979 is 979125398858.

It is a cyclic number.

It is not a de Polignac number, because 858893521979 - 2¹² = 858893517883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858893521909) 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, 859169 + ... + 1567149.

It is an arithmetic number, because the mean of its divisors is an integer number (55721723310).

Almost surely, 2^858893521979 is an apocalyptic number.

858893521979 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

858893521979 is a deficient number, since it is larger than the sum of its proper divisors (32654050981).

858893521979 is a wasteful number, since it uses less digits than its factorization.

858893521979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708430.

The product of its digits is 391910400, while the sum is 74.

The spelling of 858893521979 in words is "eight hundred fifty-eight billion, eight hundred ninety-three million, five hundred twenty-one thousand, nine hundred seventy-nine".