61688712013 has 2 divisors, whose sum is σ = 61688712014. Its totient is φ = 61688712012.

The previous prime is 61688711969. The next prime is 61688712031. The reversal of 61688712013 is 31021788616.

Together with next prime (61688712031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34865478729 + 26823233284 = 186723^2 + 163778^2 .

It is a cyclic number.

It is not a de Polignac number, because 61688712013 - 2¹³ = 61688703821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61688715013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30844356006 + 30844356007.

It is an arithmetic number, because the mean of its divisors is an integer number (30844356007).

Almost surely, 2^61688712013 is an apocalyptic number.

It is an amenable number.

61688712013 is a deficient number, since it is larger than the sum of its proper divisors (1).

61688712013 is an equidigital number, since it uses as much as digits as its factorization.

61688712013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 61688712013 in words is "sixty-one billion, six hundred eighty-eight million, seven hundred twelve thousand, thirteen".