7743999961 has 2 divisors, whose sum is σ = 7743999962. Its totient is φ = 7743999960.

The previous prime is 7743999941. The next prime is 7744000003. The reversal of 7743999961 is 1699993477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7628974336 + 115025625 = 87344^2 + 10725^2 .

It is a cyclic number.

It is not a de Polignac number, because 7743999961 - 2⁵ = 7743999929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7743999893 and 7743999902.

It is not a weakly prime, because it can be changed into another prime (7743999931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3871999980 + 3871999981.

It is an arithmetic number, because the mean of its divisors is an integer number (3871999981).

Almost surely, 2^7743999961 is an apocalyptic number.

It is an amenable number.

7743999961 is a deficient number, since it is larger than the sum of its proper divisors (1).

7743999961 is an equidigital number, since it uses as much as digits as its factorization.

7743999961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23147208, while the sum is 64.

The square root of 7743999961 is about 87999.9997784091. Note that the first 3 decimals coincide. The cubic root of 7743999961 is about 1978.4349739782.

The spelling of 7743999961 in words is "seven billion, seven hundred forty-three million, nine hundred ninety-nine thousand, nine hundred sixty-one".