137172781565 has 8 divisors (see below), whose sum is σ = 165193130808. Its totient is φ = 109347696640.

The previous prime is 137172781561. The next prime is 137172781589. The reversal of 137172781565 is 565187271731.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1190319001 + 135982462564 = 34501^2 + 368758^2 .

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

It is not a de Polignac number, because 137172781565 - 2² = 137172781561 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 (137172781561) 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, 48814532 + ... + 48817341.

It is an arithmetic number, because the mean of its divisors is an integer number (20649141351).

Almost surely, 2^137172781565 is an apocalyptic number.

It is an amenable number.

137172781565 is a deficient number, since it is larger than the sum of its proper divisors (28020349243).

137172781565 is an equidigital number, since it uses as much as digits as its factorization.

137172781565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97632159.

The product of its digits is 2469600, while the sum is 53.

The spelling of 137172781565 in words is "one hundred thirty-seven billion, one hundred seventy-two million, seven hundred eighty-one thousand, five hundred sixty-five".