137281816394 has 16 divisors (see below), whose sum is σ = 212656667496. Its totient is φ = 66416760000.

The previous prime is 137281816381. The next prime is 137281816423. The reversal of 137281816394 is 493618182731.

It can be written as a sum of positive squares in 4 ways, for example, as 114416445025 + 22865371369 = 338255^2 + 151213^2 .

It is a super-2 number, since 2×137281816394² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5111357 + ... + 5138144.

Almost surely, 2^137281816394 is an apocalyptic number.

137281816394 is a deficient number, since it is larger than the sum of its proper divisors (75374851102).

137281816394 is a wasteful number, since it uses less digits than its factorization.

137281816394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10249721.

The product of its digits is 1741824, while the sum is 53.

The spelling of 137281816394 in words is "one hundred thirty-seven billion, two hundred eighty-one million, eight hundred sixteen thousand, three hundred ninety-four".