23203356561 has 72 divisors (see below), whose sum is σ = 42588340704. Its totient is φ = 12037818240.

The previous prime is 23203356557. The next prime is 23203356571. The reversal of 23203356561 is 16565330232.

23203356561 is a `hidden beast` number, since 2 + 3 + 2 + 0 + 33 + 565 + 61 = 666.

It is not a de Polignac number, because 23203356561 - 2² = 23203356557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23203356521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4280725 + ... + 4286141.

It is an arithmetic number, because the mean of its divisors is an integer number (591504732).

Almost surely, 2^23203356561 is an apocalyptic number.

23203356561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23203356561 is a deficient number, since it is larger than the sum of its proper divisors (19384984143).

23203356561 is a wasteful number, since it uses less digits than its factorization.

23203356561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6331 (or 6321 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

Adding to 23203356561 its reverse (16565330232), we get a palindrome (39768686793).

The spelling of 23203356561 in words is "twenty-three billion, two hundred three million, three hundred fifty-six thousand, five hundred sixty-one".