137255966681 has 4 divisors (see below), whose sum is σ = 145329847092. Its totient is φ = 129182086272.

The previous prime is 137255966669. The next prime is 137255966689. The reversal of 137255966681 is 186669552731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186669552731 = 20071 ⋅9300461.

It can be written as a sum of positive squares in 2 ways, for example, as 52041015625 + 85214951056 = 228125^2 + 291916^2 .

It is a cyclic number.

It is not a de Polignac number, because 137255966681 - 2¹⁴ = 137255950297 is a prime.

It is a super-2 number, since 2×137255966681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137255966681.

It is not an unprimeable number, because it can be changed into a prime (137255966689) 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, 4036940180 + ... + 4036940213.

It is an arithmetic number, because the mean of its divisors is an integer number (36332461773).

Almost surely, 2^137255966681 is an apocalyptic number.

It is an amenable number.

137255966681 is a deficient number, since it is larger than the sum of its proper divisors (8073880411).

137255966681 is an equidigital number, since it uses as much as digits as its factorization.

137255966681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073880410.

The product of its digits is 16329600, while the sum is 59.

The spelling of 137255966681 in words is "one hundred thirty-seven billion, two hundred fifty-five million, nine hundred sixty-six thousand, six hundred eighty-one".