78982695961 has 4 divisors (see below), whose sum is σ = 85058287972. Its totient is φ = 72907103952.

The previous prime is 78982695949. The next prime is 78982695977. The reversal of 78982695961 is 16959628987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25235228736 + 53747467225 = 158856^2 + 231835^2 .

It is a cyclic number.

It is not a de Polignac number, because 78982695961 - 2⁷ = 78982695833 is a prime.

It is a super-2 number, since 2×78982695961² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78982695941) 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 in 3 ways as a sum of consecutive naturals, for example, 3037795986 + ... + 3037796011.

It is an arithmetic number, because the mean of its divisors is an integer number (21264571993).

Almost surely, 2^78982695961 is an apocalyptic number.

It is an amenable number.

78982695961 is a deficient number, since it is larger than the sum of its proper divisors (6075592011).

78982695961 is a wasteful number, since it uses less digits than its factorization.

78982695961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6075592010.

The product of its digits is 117573120, while the sum is 70.

The spelling of 78982695961 in words is "seventy-eight billion, nine hundred eighty-two million, six hundred ninety-five thousand, nine hundred sixty-one".