858953218649 has 4 divisors (see below), whose sum is σ = 864096651264. Its totient is φ = 853809786036.

The previous prime is 858953218609. The next prime is 858953218663. The reversal of 858953218649 is 946812359858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-858953218649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858953218609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2571716057 + ... + 2571716390.

It is an arithmetic number, because the mean of its divisors is an integer number (216024162816).

Almost surely, 2^858953218649 is an apocalyptic number.

It is an amenable number.

858953218649 is a deficient number, since it is larger than the sum of its proper divisors (5143432615).

858953218649 is a wasteful number, since it uses less digits than its factorization.

858953218649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143432614.

The product of its digits is 149299200, while the sum is 68.

The spelling of 858953218649 in words is "eight hundred fifty-eight billion, nine hundred fifty-three million, two hundred eighteen thousand, six hundred forty-nine".