7919666549 has 2 divisors, whose sum is σ = 7919666550. Its totient is φ = 7919666548.

The previous prime is 7919666543. The next prime is 7919666561. The reversal of 7919666549 is 9456669197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6847562500 + 1072104049 = 82750^2 + 32743^2 .

It is a cyclic number.

It is not a de Polignac number, because 7919666549 - 2¹⁶ = 7919601013 is a prime.

It is a super-2 number, since 2×7919666549² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7919666491 and 7919666500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7919666543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3959833274 + 3959833275.

It is an arithmetic number, because the mean of its divisors is an integer number (3959833275).

Almost surely, 2^7919666549 is an apocalyptic number.

It is an amenable number.

7919666549 is a deficient number, since it is larger than the sum of its proper divisors (1).

7919666549 is an equidigital number, since it uses as much as digits as its factorization.

7919666549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22044960, while the sum is 62.

The square root of 7919666549 is about 88992.5083869423. The cubic root of 7919666549 is about 1993.2830120411.

The spelling of 7919666549 in words is "seven billion, nine hundred nineteen million, six hundred sixty-six thousand, five hundred forty-nine".