61316664787519 has 2 divisors, whose sum is σ = 61316664787520. Its totient is φ = 61316664787518.

The previous prime is 61316664787513. The next prime is 61316664787523. The reversal of 61316664787519 is 91578746661316.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61316664787519 - 2¹³ = 61316664779327 is a prime.

It is a super-2 number, since 2×61316664787519² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61316664787513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30658332393759 + 30658332393760.

It is an arithmetic number, because the mean of its divisors is an integer number (30658332393760).

Almost surely, 2^{61316664787519} is an apocalyptic number.

61316664787519 is a deficient number, since it is larger than the sum of its proper divisors (1).

61316664787519 is an equidigital number, since it uses as much as digits as its factorization.

61316664787519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 274337280, while the sum is 70.

The spelling of 61316664787519 in words is "sixty-one trillion, three hundred sixteen billion, six hundred sixty-four million, seven hundred eighty-seven thousand, five hundred nineteen".