857445942809 has 16 divisors (see below), whose sum is σ = 915009322752. Its totient is φ = 801771683328.

The previous prime is 857445942797. The next prime is 857445942811. The reversal of 857445942809 is 908249544758.

It is a cyclic number.

It is not a de Polignac number, because 857445942809 - 2¹⁶ = 857445877273 is a prime.

It is a super-2 number, since 2×857445942809² (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 (857445942209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2069957 + ... + 2449410.

It is an arithmetic number, because the mean of its divisors is an integer number (57188082672).

Almost surely, 2^857445942809 is an apocalyptic number.

It is an amenable number.

857445942809 is a deficient number, since it is larger than the sum of its proper divisors (57563379943).

857445942809 is a wasteful number, since it uses less digits than its factorization.

857445942809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519576.

The product of its (nonzero) digits is 116121600, while the sum is 65.

The spelling of 857445942809 in words is "eight hundred fifty-seven billion, four hundred forty-five million, nine hundred forty-two thousand, eight hundred nine".