204422163561 has 96 divisors (see below), whose sum is σ = 387256066560. Its totient is φ = 105381712800.

The previous prime is 204422163551. The next prime is 204422163563. The reversal of 204422163561 is 165361224402.

204422163561 is a `hidden beast` number, since 2 + 0 + 442 + 2 + 163 + 56 + 1 = 666.

It is not a de Polignac number, because 204422163561 - 2²² = 204417969257 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (204422163563) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1852830 + ... + 1960056.

It is an arithmetic number, because the mean of its divisors is an integer number (4033917360).

Almost surely, 2^204422163561 is an apocalyptic number.

204422163561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204422163561 is a deficient number, since it is larger than the sum of its proper divisors (182833902999).

204422163561 is a wasteful number, since it uses less digits than its factorization.

204422163561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107392 (or 107379 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 204422163561 its reverse (165361224402), we get a palindrome (369783387963).

The spelling of 204422163561 in words is "two hundred four billion, four hundred twenty-two million, one hundred sixty-three thousand, five hundred sixty-one".