137666139647 has 4 divisors (see below), whose sum is σ = 140595206496. Its totient is φ = 134737072800.

The previous prime is 137666139629. The next prime is 137666139661. The reversal of 137666139647 is 746931666731.

137666139647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 137666139647 - 2²⁶ = 137599030783 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 (137666130647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1464533354 + ... + 1464533447.

It is an arithmetic number, because the mean of its divisors is an integer number (35148801624).

Almost surely, 2^137666139647 is an apocalyptic number.

137666139647 is a deficient number, since it is larger than the sum of its proper divisors (2929066849).

137666139647 is an equidigital number, since it uses as much as digits as its factorization.

137666139647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929066848.

The product of its digits is 20575296, while the sum is 59.

The spelling of 137666139647 in words is "one hundred thirty-seven billion, six hundred sixty-six million, one hundred thirty-nine thousand, six hundred forty-seven".