7641721453 has 2 divisors, whose sum is σ = 7641721454. Its totient is φ = 7641721452.

The previous prime is 7641721447. The next prime is 7641721469. The reversal of 7641721453 is 3541271467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6352408804 + 1289312649 = 79702^2 + 35907^2 .

It is an emirp because it is prime and its reverse (3541271467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7641721453 - 2⁵ = 7641721421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7641721403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3820860726 + 3820860727.

It is an arithmetic number, because the mean of its divisors is an integer number (3820860727).

Almost surely, 2^7641721453 is an apocalyptic number.

It is an amenable number.

7641721453 is a deficient number, since it is larger than the sum of its proper divisors (1).

7641721453 is an equidigital number, since it uses as much as digits as its factorization.

7641721453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 40.

The square root of 7641721453 is about 87416.9403090728. The cubic root of 7641721453 is about 1969.6863160178.

It can be divided in two parts, 764172 and 1453, that added together give a square (765625 = 875²).

The spelling of 7641721453 in words is "seven billion, six hundred forty-one million, seven hundred twenty-one thousand, four hundred fifty-three".