136981609897 has 4 divisors (see below), whose sum is σ = 149434483536. Its totient is φ = 124528736260.

The previous prime is 136981609871. The next prime is 136981609927. The reversal of 136981609897 is 798906189631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 136981609897 - 2²³ = 136973221289 is a prime.

It is a super-2 number, since 2×136981609897² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136981609867) 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, 6226436803 + ... + 6226436824.

It is an arithmetic number, because the mean of its divisors is an integer number (37358620884).

Almost surely, 2^136981609897 is an apocalyptic number.

It is an amenable number.

136981609897 is a deficient number, since it is larger than the sum of its proper divisors (12452873639).

136981609897 is a wasteful number, since it uses less digits than its factorization.

136981609897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12452873638.

The product of its (nonzero) digits is 35271936, while the sum is 67.

The spelling of 136981609897 in words is "one hundred thirty-six billion, nine hundred eighty-one million, six hundred nine thousand, eight hundred ninety-seven".