612000008181 has 6 divisors (see below), whose sum is σ = 884000011830. Its totient is φ = 408000005448.

The previous prime is 612000008167. The next prime is 612000008183. The reversal of 612000008181 is 181800000216.

It can be written as a sum of positive squares in only one way, i.e., 397940180625 + 214059827556 = 630825^2 + 462666^2 .

It is not a de Polignac number, because 612000008181 - 2¹¹ = 612000006133 is a prime.

It is a super-2 number, since 2×612000008181² (a number of 24 digits) contains 22 as substring.

612000008181 is a modest number, since divided by 8181 gives 6120 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612000008183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34000000446 + ... + 34000000463.

It is an arithmetic number, because the mean of its divisors is an integer number (147333335305).

Almost surely, 2^612000008181 is an apocalyptic number.

It is an amenable number.

612000008181 is a deficient number, since it is larger than the sum of its proper divisors (272000003649).

612000008181 is a wasteful number, since it uses less digits than its factorization.

612000008181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68000000915 (or 68000000912 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

Adding to 612000008181 its reverse (181800000216), we get a palindrome (793800008397).

The spelling of 612000008181 in words is "six hundred twelve billion, eight thousand, one hundred eighty-one".