7866541242 has 72 divisors (see below), whose sum is σ = 19926972000. Its totient is φ = 2236238928.

The previous prime is 7866541237. The next prime is 7866541289. The reversal of 7866541242 is 2421456687.

7866541242 is a `hidden beast` number, since 7 + 8 + 66 + 541 + 2 + 42 = 666.

It is a super-2 number, since 2×7866541242² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 153109 + ... + 197927.

It is an arithmetic number, because the mean of its divisors is an integer number (276763500).

Almost surely, 2^7866541242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7866541242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9963486000).

7866541242 is an abundant number, since it is smaller than the sum of its proper divisors (12060430758).

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

7866541242 is a wasteful number, since it uses less digits than its factorization.

7866541242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45040 (or 45030 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 7866541242 is about 88693.5242393716. The cubic root of 7866541242 is about 1988.8160126224.

The spelling of 7866541242 in words is "seven billion, eight hundred sixty-six million, five hundred forty-one thousand, two hundred forty-two".