6857855642 has 32 divisors (see below), whose sum is σ = 11310528960. Its totient is φ = 3092670720.

The previous prime is 6857855639. The next prime is 6857855647. The reversal of 6857855642 is 2465587586.

It is a super-2 number, since 2×6857855642² = 94060368013022464328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6857855647) 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, 2627234 + ... + 2629842.

It is an arithmetic number, because the mean of its divisors is an integer number (353454030).

Almost surely, 2^6857855642 is an apocalyptic number.

6857855642 is a deficient number, since it is larger than the sum of its proper divisors (4452673318).

6857855642 is a wasteful number, since it uses less digits than its factorization.

6857855642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518.

The product of its digits is 16128000, while the sum is 56.

The square root of 6857855642 is about 82812.1708567044. The cubic root of 6857855642 is about 1899.8943285644.

The spelling of 6857855642 in words is "six billion, eight hundred fifty-seven million, eight hundred fifty-five thousand, six hundred forty-two".