36138978137 has 4 divisors (see below), whose sum is σ = 37710238080. Its totient is φ = 34567718196.

The previous prime is 36138978121. The next prime is 36138978157. The reversal of 36138978137 is 73187983163.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73187983163 = 37 ⋅1978053599.

It is a cyclic number.

It is not a de Polignac number, because 36138978137 - 2⁴ = 36138978121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36138978157) 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, 785629937 + ... + 785629982.

It is an arithmetic number, because the mean of its divisors is an integer number (9427559520).

Almost surely, 2^36138978137 is an apocalyptic number.

It is an amenable number.

36138978137 is a deficient number, since it is larger than the sum of its proper divisors (1571259943).

36138978137 is a wasteful number, since it uses less digits than its factorization.

36138978137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571259942.

The product of its digits is 4572288, while the sum is 56.

The spelling of 36138978137 in words is "thirty-six billion, one hundred thirty-eight million, nine hundred seventy-eight thousand, one hundred thirty-seven".