7909881965 has 16 divisors (see below), whose sum is σ = 9541274688. Its totient is φ = 6295007616.

The previous prime is 7909881961. The next prime is 7909881971. The reversal of 7909881965 is 5691889097.

It is a cyclic number.

It is not a de Polignac number, because 7909881965 - 2² = 7909881961 is a prime.

It is a super-2 number, since 2×7909881965² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7909881898 and 7909881907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7909881961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2169434 + ... + 2173076.

It is an arithmetic number, because the mean of its divisors is an integer number (596329668).

Almost surely, 2^7909881965 is an apocalyptic number.

It is an amenable number.

7909881965 is a deficient number, since it is larger than the sum of its proper divisors (1631392723).

7909881965 is a wasteful number, since it uses less digits than its factorization.

7909881965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788.

The product of its (nonzero) digits is 9797760, while the sum is 62.

The square root of 7909881965 is about 88937.5171960630. The cubic root of 7909881965 is about 1992.4617871196.

The spelling of 7909881965 in words is "seven billion, nine hundred nine million, eight hundred eighty-one thousand, nine hundred sixty-five".