137666437 has 2 divisors, whose sum is σ = 137666438. Its totient is φ = 137666436.

The previous prime is 137666407. The next prime is 137666453. The reversal of 137666437 is 734666731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109851361 + 27815076 = 10481^2 + 5274^2 .

It is a cyclic number.

It is not a de Polignac number, because 137666437 - 2¹¹ = 137664389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 137666393 and 137666402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137666407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68833218 + 68833219.

It is an arithmetic number, because the mean of its divisors is an integer number (68833219).

Almost surely, 2^137666437 is an apocalyptic number.

It is an amenable number.

137666437 is a deficient number, since it is larger than the sum of its proper divisors (1).

137666437 is an equidigital number, since it uses as much as digits as its factorization.

137666437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 43.

The square root of 137666437 is about 11733.1341507715. The cubic root of 137666437 is about 516.3482278249.

The spelling of 137666437 in words is "one hundred thirty-seven million, six hundred sixty-six thousand, four hundred thirty-seven".