857215864454 has 4 divisors (see below), whose sum is σ = 1285823796684. Its totient is φ = 428607932226.

The previous prime is 857215864399. The next prime is 857215864459. The reversal of 857215864454 is 454468512758.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 857215864393 and 857215864402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857215864459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214303966112 + ... + 214303966115.

It is an arithmetic number, because the mean of its divisors is an integer number (321455949171).

Almost surely, 2^857215864454 is an apocalyptic number.

857215864454 is a deficient number, since it is larger than the sum of its proper divisors (428607932230).

857215864454 is a wasteful number, since it uses less digits than its factorization.

857215864454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428607932229.

The product of its digits is 43008000, while the sum is 59.

The spelling of 857215864454 in words is "eight hundred fifty-seven billion, two hundred fifteen million, eight hundred sixty-four thousand, four hundred fifty-four".