618544861 has 6 divisors (see below), whose sum is σ = 679888286. Its totient is φ = 562313400.

The previous prime is 618544859. The next prime is 618544889. The reversal of 618544861 is 168445816.

It can be written as a sum of positive squares in only one way, i.e., 510488836 + 108056025 = 22594^2 + 10395^2 .

It is not a de Polignac number, because 618544861 - 2¹ = 618544859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618544831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2555850 + ... + 2556091.

Almost surely, 2^618544861 is an apocalyptic number.

It is an amenable number.

618544861 is a deficient number, since it is larger than the sum of its proper divisors (61343425).

618544861 is a wasteful number, since it uses less digits than its factorization.

618544861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111963 (or 5111952 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The square root of 618544861 is about 24870.5621367914. The cubic root of 618544861 is about 852.0342790950.

The spelling of 618544861 in words is "six hundred eighteen million, five hundred forty-four thousand, eight hundred sixty-one".