137666407 has 2 divisors, whose sum is σ = 137666408. Its totient is φ = 137666406.

The previous prime is 137666383. The next prime is 137666437. The reversal of 137666407 is 704666731.

It is a weak prime.

It is an emirp because it is prime and its reverse (704666731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137666407 - 2⁷ = 137666279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 137666407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137666437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68833203 + 68833204.

It is an arithmetic number, because the mean of its divisors is an integer number (68833204).

Almost surely, 2^137666407 is an apocalyptic number.

137666407 is a deficient number, since it is larger than the sum of its proper divisors (1).

137666407 is an equidigital number, since it uses as much as digits as its factorization.

137666407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 137666407 is about 11733.1328723406. The cubic root of 137666407 is about 516.3481903177.

The spelling of 137666407 in words is "one hundred thirty-seven million, six hundred sixty-six thousand, four hundred seven".