137665861 has 8 divisors (see below), whose sum is σ = 138710880. Its totient is φ = 136625328.

The previous prime is 137665831. The next prime is 137665873. The reversal of 137665861 is 168566731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137665861 - 2²¹ = 135568709 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 (137665831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81750 + ... + 83416.

It is an arithmetic number, because the mean of its divisors is an integer number (17338860).

Almost surely, 2^137665861 is an apocalyptic number.

It is an amenable number.

137665861 is a deficient number, since it is larger than the sum of its proper divisors (1045019).

137665861 is a wasteful number, since it uses less digits than its factorization.

137665861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243.

The product of its digits is 181440, while the sum is 43.

The square root of 137665861 is about 11733.1096048746. The cubic root of 137665861 is about 516.3475076857.

The spelling of 137665861 in words is "one hundred thirty-seven million, six hundred sixty-five thousand, eight hundred sixty-one".