7880756981 has 2 divisors, whose sum is σ = 7880756982. Its totient is φ = 7880756980.

The previous prime is 7880756971. The next prime is 7880756993. The reversal of 7880756981 is 1896570887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6470754481 + 1410002500 = 80441^2 + 37550^2 .

It is an emirp because it is prime and its reverse (1896570887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7880756981 - 2¹⁰ = 7880755957 is a prime.

It is a super-2 number, since 2×7880756981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7880756981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7880756971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940378490 + 3940378491.

It is an arithmetic number, because the mean of its divisors is an integer number (3940378491).

Almost surely, 2^7880756981 is an apocalyptic number.

It is an amenable number.

7880756981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7880756981 is an equidigital number, since it uses as much as digits as its factorization.

7880756981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 59.

The square root of 7880756981 is about 88773.6277336913. The cubic root of 7880756981 is about 1990.0132976393.

The spelling of 7880756981 in words is "seven billion, eight hundred eighty million, seven hundred fifty-six thousand, nine hundred eighty-one".