6569994942 has 128 divisors (see below), whose sum is σ = 17672601600. Its totient is φ = 1768570848.

The previous prime is 6569994901. The next prime is 6569994953. The reversal of 6569994942 is 2494999656.

6569994942 is a `hidden beast` number, since 6 + 56 + 9 + 99 + 494 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 6569994942.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 576859 + ... + 588137.

It is an arithmetic number, because the mean of its divisors is an integer number (138067200).

Almost surely, 2^6569994942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6569994942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8836300800).

6569994942 is an abundant number, since it is smaller than the sum of its proper divisors (11102606658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6569994942 is a wasteful number, since it uses less digits than its factorization.

6569994942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11387 (or 11381 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 63.

The square root of 6569994942 is about 81055.5053158020. The cubic root of 6569994942 is about 1872.9305705800.

The spelling of 6569994942 in words is "six billion, five hundred sixty-nine million, nine hundred ninety-four thousand, nine hundred forty-two".