7166721151 has 4 divisors (see below), whose sum is σ = 7236301072. Its totient is φ = 7097141232.

The previous prime is 7166721139. The next prime is 7166721197. The reversal of 7166721151 is 1511276617.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1511276617 = 23 ⋅65707679.

It is a cyclic number.

It is not a de Polignac number, because 7166721151 - 2¹¹ = 7166719103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7166721151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7166721451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34789806 + ... + 34790011.

It is an arithmetic number, because the mean of its divisors is an integer number (1809075268).

Almost surely, 2^7166721151 is an apocalyptic number.

7166721151 is a deficient number, since it is larger than the sum of its proper divisors (69579921).

7166721151 is a wasteful number, since it uses less digits than its factorization.

7166721151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69579920.

The product of its digits is 17640, while the sum is 37.

The square root of 7166721151 is about 84656.4891251698. The cubic root of 7166721151 is about 1927.9991390432. Note that the first 3 decimals are identical.

Adding to 7166721151 its reverse (1511276617), we get a palindrome (8677997768).

The spelling of 7166721151 in words is "seven billion, one hundred sixty-six million, seven hundred twenty-one thousand, one hundred fifty-one".