7980781766 has 16 divisors (see below), whose sum is σ = 12126128640. Its totient is φ = 3938767560.

The previous prime is 7980781723. The next prime is 7980781813. The reversal of 7980781766 is 6671870897.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034375 + ... + 1042061.

It is an arithmetic number, because the mean of its divisors is an integer number (757883040).

Almost surely, 2^7980781766 is an apocalyptic number.

7980781766 is a deficient number, since it is larger than the sum of its proper divisors (4145346874).

7980781766 is a wasteful number, since it uses less digits than its factorization.

7980781766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14339.

The product of its (nonzero) digits is 7112448, while the sum is 59.

The square root of 7980781766 is about 89335.2213071642. The cubic root of 7980781766 is about 1998.3971963534.

The spelling of 7980781766 in words is "seven billion, nine hundred eighty million, seven hundred eighty-one thousand, seven hundred sixty-six".