136668551 has 2 divisors, whose sum is σ = 136668552. Its totient is φ = 136668550.

The previous prime is 136668529. The next prime is 136668557. The reversal of 136668551 is 155866631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136668551 - 2¹⁰ = 136667527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 136668499 and 136668508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136668557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68334275 + 68334276.

It is an arithmetic number, because the mean of its divisors is an integer number (68334276).

Almost surely, 2^136668551 is an apocalyptic number.

136668551 is a deficient number, since it is larger than the sum of its proper divisors (1).

136668551 is an equidigital number, since it uses as much as digits as its factorization.

136668551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 136668551 is about 11690.5325370575. The cubic root of 136668551 is about 515.0976042737.

The spelling of 136668551 in words is "one hundred thirty-six million, six hundred sixty-eight thousand, five hundred fifty-one".