61969694837 has 2 divisors, whose sum is σ = 61969694838. Its totient is φ = 61969694836.

The previous prime is 61969694833. The next prime is 61969694867. The reversal of 61969694837 is 73849696916.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60375369796 + 1594325041 = 245714^2 + 39929^2 .

It is a cyclic number.

It is not a de Polignac number, because 61969694837 - 2² = 61969694833 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61969694833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30984847418 + 30984847419.

It is an arithmetic number, because the mean of its divisors is an integer number (30984847419).

Almost surely, 2^61969694837 is an apocalyptic number.

It is an amenable number.

61969694837 is a deficient number, since it is larger than the sum of its proper divisors (1).

61969694837 is an equidigital number, since it uses as much as digits as its factorization.

61969694837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105815808, while the sum is 68.

The spelling of 61969694837 in words is "sixty-one billion, nine hundred sixty-nine million, six hundred ninety-four thousand, eight hundred thirty-seven".