7721325361 has 4 divisors (see below), whose sum is σ = 7721670132. Its totient is φ = 7720980592.

The previous prime is 7721325329. The next prime is 7721325389. The reversal of 7721325361 is 1635231277.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6863128336 + 858197025 = 82844^2 + 29295^2 .

It is a cyclic number.

It is not a de Polignac number, because 7721325361 - 2⁵ = 7721325329 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 7721325361.

It is not an unprimeable number, because it can be changed into a prime (7721325301) 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, 136270 + ... + 184423.

It is an arithmetic number, because the mean of its divisors is an integer number (1930417533).

Almost surely, 2^7721325361 is an apocalyptic number.

It is an amenable number.

7721325361 is a deficient number, since it is larger than the sum of its proper divisors (344771).

7721325361 is a wasteful number, since it uses less digits than its factorization.

7721325361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344770.

The product of its digits is 52920, while the sum is 37.

The square root of 7721325361 is about 87871.0723787982. The cubic root of 7721325361 is about 1976.5021194177.

The spelling of 7721325361 in words is "seven billion, seven hundred twenty-one million, three hundred twenty-five thousand, three hundred sixty-one".