857981835643 has 4 divisors (see below), whose sum is σ = 858005295840. Its totient is φ = 857958375448.

The previous prime is 857981835593. The next prime is 857981835671. The reversal of 857981835643 is 346538189758.

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

It is a cyclic number.

It is not a de Polignac number, because 857981835643 - 2²⁹ = 857444964731 is a prime.

It is a super-2 number, since 2×857981835643² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857981836643) 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, 11675155 + ... + 11748412.

It is an arithmetic number, because the mean of its divisors is an integer number (214501323960).

Almost surely, 2^857981835643 is an apocalyptic number.

857981835643 is a deficient number, since it is larger than the sum of its proper divisors (23460197).

857981835643 is a wasteful number, since it uses less digits than its factorization.

857981835643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23460196.

The product of its digits is 174182400, while the sum is 67.

The spelling of 857981835643 in words is "eight hundred fifty-seven billion, nine hundred eighty-one million, eight hundred thirty-five thousand, six hundred forty-three".