137666413 has 4 divisors (see below), whose sum is σ = 137702268. Its totient is φ = 137630560.

The previous prime is 137666407. The next prime is 137666437. The reversal of 137666413 is 314666731.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38105929 + 99560484 = 6173^2 + 9978^2 .

It is a cyclic number.

It is not a de Polignac number, because 137666413 - 2¹⁷ = 137535341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137666453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11368 + ... + 20113.

It is an arithmetic number, because the mean of its divisors is an integer number (34425567).

Almost surely, 2^137666413 is an apocalyptic number.

It is an amenable number.

137666413 is a deficient number, since it is larger than the sum of its proper divisors (35855).

137666413 is an equidigital number, since it uses as much as digits as its factorization.

137666413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35854.

The product of its digits is 54432, while the sum is 37.

The square root of 137666413 is about 11733.1331280268. The cubic root of 137666413 is about 516.3481978191.

The spelling of 137666413 in words is "one hundred thirty-seven million, six hundred sixty-six thousand, four hundred thirteen".