612136813889 has 4 divisors (see below), whose sum is σ = 618079889856. Its totient is φ = 606193737924.

The previous prime is 612136813879. The next prime is 612136813907. The reversal of 612136813889 is 988318631216.

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 a de Polignac number, because none of the positive numbers 2^k-612136813889 is a prime.

It is a super-2 number, since 2×612136813889² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612136813829) 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, 2971537829 + ... + 2971538034.

It is an arithmetic number, because the mean of its divisors is an integer number (154519972464).

Almost surely, 2^612136813889 is an apocalyptic number.

It is an amenable number.

612136813889 is a deficient number, since it is larger than the sum of its proper divisors (5943075967).

612136813889 is a wasteful number, since it uses less digits than its factorization.

612136813889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943075966.

The product of its digits is 2985984, while the sum is 56.

The spelling of 612136813889 in words is "six hundred twelve billion, one hundred thirty-six million, eight hundred thirteen thousand, eight hundred eighty-nine".