68949147409 has 2 divisors, whose sum is σ = 68949147410. Its totient is φ = 68949147408.

The previous prime is 68949147373. The next prime is 68949147413. The reversal of 68949147409 is 90474194986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68748840000 + 200307409 = 262200^2 + 14153^2 .

It is a cyclic number.

It is not a de Polignac number, because 68949147409 - 2⁹ = 68949146897 is a prime.

It is a super-2 number, since 2×68949147409² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68949147469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34474573704 + 34474573705.

It is an arithmetic number, because the mean of its divisors is an integer number (34474573705).

Almost surely, 2^68949147409 is an apocalyptic number.

It is an amenable number.

68949147409 is a deficient number, since it is larger than the sum of its proper divisors (1).

68949147409 is an equidigital number, since it uses as much as digits as its factorization.

68949147409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 68949147409 in words is "sixty-eight billion, nine hundred forty-nine million, one hundred forty-seven thousand, four hundred nine".