9661814719 has 2 divisors, whose sum is σ = 9661814720. Its totient is φ = 9661814718.

The previous prime is 9661814713. The next prime is 9661814737. The reversal of 9661814719 is 9174181669.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9661814719 - 2³ = 9661814711 is a prime.

It is a super-2 number, since 2×9661814719² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9661814711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830907359 + 4830907360.

It is an arithmetic number, because the mean of its divisors is an integer number (4830907360).

Almost surely, 2^9661814719 is an apocalyptic number.

9661814719 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661814719 is an equidigital number, since it uses as much as digits as its factorization.

9661814719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 52.

The square root of 9661814719 is about 98294.5304632969. The cubic root of 9661814719 is about 2129.8690448999.

The spelling of 9661814719 in words is "nine billion, six hundred sixty-one million, eight hundred fourteen thousand, seven hundred nineteen".