7966572138 has 96 divisors (see below), whose sum is σ = 20435530752. Its totient is φ = 2194905600.

The previous prime is 7966572101. The next prime is 7966572139. The reversal of 7966572138 is 8312756697.

7966572138 is a `hidden beast` number, since 7 + 9 + 66 + 572 + 1 + 3 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (7966572139) 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 47 ways as a sum of consecutive naturals, for example, 1140978 + ... + 1147938.

It is an arithmetic number, because the mean of its divisors is an integer number (212870112).

Almost surely, 2^7966572138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7966572138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10217765376).

7966572138 is an abundant number, since it is smaller than the sum of its proper divisors (12468958614).

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

7966572138 is a wasteful number, since it uses less digits than its factorization.

7966572138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7300 (or 7297 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 7966572138 is about 89255.6560560730. The cubic root of 7966572138 is about 1997.2104558640.

The spelling of 7966572138 in words is "seven billion, nine hundred sixty-six million, five hundred seventy-two thousand, one hundred thirty-eight".