7643272961 has 2 divisors, whose sum is σ = 7643272962. Its totient is φ = 7643272960.

The previous prime is 7643272943. The next prime is 7643272979. The reversal of 7643272961 is 1692723467.

It is a balanced prime because it is at equal distance from previous prime (7643272943) and next prime (7643272979).

It can be written as a sum of positive squares in only one way, i.e., 6376980736 + 1266292225 = 79856^2 + 35585^2 .

It is an emirp because it is prime and its reverse (1692723467) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7643272961 is a prime.

It is not a weakly prime, because it can be changed into another prime (7643272361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821636480 + 3821636481.

It is an arithmetic number, because the mean of its divisors is an integer number (3821636481).

Almost surely, 2^7643272961 is an apocalyptic number.

It is an amenable number.

7643272961 is a deficient number, since it is larger than the sum of its proper divisors (1).

7643272961 is an equidigital number, since it uses as much as digits as its factorization.

7643272961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 47.

The square root of 7643272961 is about 87425.8140425355. The cubic root of 7643272961 is about 1969.8196096000.

The spelling of 7643272961 in words is "seven billion, six hundred forty-three million, two hundred seventy-two thousand, nine hundred sixty-one".