618695356221 has 16 divisors (see below), whose sum is σ = 922423844800. Its totient is φ = 409836411504.

The previous prime is 618695356157. The next prime is 618695356243. The reversal of 618695356221 is 122653596816.

618695356221 is a `hidden beast` number, since 6 + 1 + 8 + 6 + 9 + 5 + 3 + 5 + 622 + 1 = 666.

It is not a de Polignac number, because 618695356221 - 2⁶ = 618695356157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618695356271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72972331 + ... + 72980808.

It is an arithmetic number, because the mean of its divisors is an integer number (57651490300).

Almost surely, 2^618695356221 is an apocalyptic number.

It is an amenable number.

618695356221 is a deficient number, since it is larger than the sum of its proper divisors (303728488579).

618695356221 is a wasteful number, since it uses less digits than its factorization.

618695356221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145953305 (or 145953299 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 618695356221 in words is "six hundred eighteen billion, six hundred ninety-five million, three hundred fifty-six thousand, two hundred twenty-one".