69679778981 has 2 divisors, whose sum is σ = 69679778982. Its totient is φ = 69679778980.

The previous prime is 69679778963. The next prime is 69679779083. The reversal of 69679778981 is 18987797696.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57631204225 + 12048574756 = 240065^2 + 109766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69679778981 is a prime.

It is a super-2 number, since 2×69679778981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69679778911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34839889490 + 34839889491.

It is an arithmetic number, because the mean of its divisors is an integer number (34839889491).

Almost surely, 2^69679778981 is an apocalyptic number.

It is an amenable number.

69679778981 is a deficient number, since it is larger than the sum of its proper divisors (1).

69679778981 is an equidigital number, since it uses as much as digits as its factorization.

69679778981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576108288, while the sum is 77.

The spelling of 69679778981 in words is "sixty-nine billion, six hundred seventy-nine million, seven hundred seventy-eight thousand, nine hundred eighty-one".