7613164721 has 4 divisors (see below), whose sum is σ = 7617171444. Its totient is φ = 7609158000.

The previous prime is 7613164711. The next prime is 7613164751. The reversal of 7613164721 is 1274613167.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1274613167 = 59 ⋅21603613.

It can be written as a sum of positive squares in 2 ways, for example, as 721674496 + 6891490225 = 26864^2 + 83015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7613164721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7613164711) 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, 2000510 + ... + 2004311.

It is an arithmetic number, because the mean of its divisors is an integer number (1904292861).

Almost surely, 2^7613164721 is an apocalyptic number.

It is an amenable number.

7613164721 is a deficient number, since it is larger than the sum of its proper divisors (4006723).

7613164721 is a wasteful number, since it uses less digits than its factorization.

7613164721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006722.

The product of its digits is 42336, while the sum is 38.

The square root of 7613164721 is about 87253.4510549583. The cubic root of 7613164721 is about 1967.2297135581.

Adding to 7613164721 its reverse (1274613167), we get a palindrome (8887777888).

The spelling of 7613164721 in words is "seven billion, six hundred thirteen million, one hundred sixty-four thousand, seven hundred twenty-one".