618825179561 has 8 divisors (see below), whose sum is σ = 635584149384. Its totient is φ = 602067997440.

The previous prime is 618825179537. The next prime is 618825179569. The reversal of 618825179561 is 165971528816.

It can be written as a sum of positive squares in 4 ways, for example, as 222636760336 + 396188419225 = 471844^2 + 629435^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 618825179561 - 2¹⁰ = 618825178537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 618825179561.

It is not an unprimeable number, because it can be changed into a prime (618825179569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270131 + ... + 1144823.

It is an arithmetic number, because the mean of its divisors is an integer number (79448018673).

Almost surely, 2^618825179561 is an apocalyptic number.

It is an amenable number.

618825179561 is a deficient number, since it is larger than the sum of its proper divisors (16758969823).

618825179561 is a wasteful number, since it uses less digits than its factorization.

618825179561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893851.

The product of its digits is 7257600, while the sum is 59.

The spelling of 618825179561 in words is "six hundred eighteen billion, eight hundred twenty-five million, one hundred seventy-nine thousand, five hundred sixty-one".