68664719 has 2 divisors, whose sum is σ = 68664720. Its totient is φ = 68664718.

The previous prime is 68664647. The next prime is 68664767. The reversal of 68664719 is 91746686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68664719 - 2¹⁶ = 68599183 is a prime.

It is a super-2 number, since 2×68664719² = 9429687270697922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68664769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34332359 + 34332360.

It is an arithmetic number, because the mean of its divisors is an integer number (34332360).

Almost surely, 2^68664719 is an apocalyptic number.

68664719 is a deficient number, since it is larger than the sum of its proper divisors (1).

68664719 is an equidigital number, since it uses as much as digits as its factorization.

68664719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 68664719 is about 8286.4177423058. The cubic root of 68664719 is about 409.4911772437.

The spelling of 68664719 in words is "sixty-eight million, six hundred sixty-four thousand, seven hundred nineteen".