61318223719 has 2 divisors, whose sum is σ = 61318223720. Its totient is φ = 61318223718.

The previous prime is 61318223717. The next prime is 61318223737. The reversal of 61318223719 is 91732281316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61318223719 - 2¹ = 61318223717 is a prime.

It is a super-2 number, since 2×61318223719² (a number of 22 digits) contains 22 as substring.

Together with 61318223717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61318223717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30659111859 + 30659111860.

It is an arithmetic number, because the mean of its divisors is an integer number (30659111860).

Almost surely, 2^61318223719 is an apocalyptic number.

61318223719 is a deficient number, since it is larger than the sum of its proper divisors (1).

61318223719 is an equidigital number, since it uses as much as digits as its factorization.

61318223719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The spelling of 61318223719 in words is "sixty-one billion, three hundred eighteen million, two hundred twenty-three thousand, seven hundred nineteen".