7928666761 has 2 divisors, whose sum is σ = 7928666762. Its totient is φ = 7928666760.

The previous prime is 7928666749. The next prime is 7928666819. The reversal of 7928666761 is 1676668297.

It is a happy number.

It is an a-pointer prime, because the next prime (7928666819) can be obtained adding 7928666761 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7238606400 + 690060361 = 85080^2 + 26269^2 .

It is a cyclic number.

It is not a de Polignac number, because 7928666761 - 2¹⁹ = 7928142473 is a prime.

It is a super-2 number, since 2×7928666761² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7928666696 and 7928666705.

It is not a weakly prime, because it can be changed into another prime (7928666861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3964333380 + 3964333381.

It is an arithmetic number, because the mean of its divisors is an integer number (3964333381).

Almost surely, 2^7928666761 is an apocalyptic number.

It is an amenable number.

7928666761 is a deficient number, since it is larger than the sum of its proper divisors (1).

7928666761 is an equidigital number, since it uses as much as digits as its factorization.

7928666761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 58.

The square root of 7928666761 is about 89043.0612737455. The cubic root of 7928666761 is about 1994.0378072071.

The spelling of 7928666761 in words is "seven billion, nine hundred twenty-eight million, six hundred sixty-six thousand, seven hundred sixty-one".