618822358782161 has 4 divisors (see below), whose sum is σ = 623274318198000. Its totient is φ = 614370399366324.

The previous prime is 618822358782149. The next prime is 618822358782167. The reversal of 618822358782161 is 161287853228816.

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 not a de Polignac number, because 618822358782161 - 2³⁸ = 618547480875217 is a prime.

It is a super-2 number, since 2×618822358782161² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 618822358782091 and 618822358782100.

It is not an unprimeable number, because it can be changed into a prime (618822358782167) 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, 2225979707711 + ... + 2225979707988.

It is an arithmetic number, because the mean of its divisors is an integer number (155818579549500).

Almost surely, 2^{618822358782161} is an apocalyptic number.

It is an amenable number.

618822358782161 is a deficient number, since it is larger than the sum of its proper divisors (4451959415839).

618822358782161 is a wasteful number, since it uses less digits than its factorization.

618822358782161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451959415838.

The product of its digits is 123863040, while the sum is 68.

The spelling of 618822358782161 in words is "six hundred eighteen trillion, eight hundred twenty-two billion, three hundred fifty-eight million, seven hundred eighty-two thousand, one hundred sixty-one".