23556821945 has 8 divisors (see below), whose sum is σ = 29242951560. Its totient is φ = 18195614080.

The previous prime is 23556821941. The next prime is 23556821957. The reversal of 23556821945 is 54912865532.

It can be written as a sum of positive squares in 4 ways, for example, as 5421082384 + 18135739561 = 73628^2 + 134669^2 .

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

It is not a de Polignac number, because 23556821945 - 2² = 23556821941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23556821893 and 23556821902.

It is not an unprimeable number, because it can be changed into a prime (23556821941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81230276 + ... + 81230565.

It is an arithmetic number, because the mean of its divisors is an integer number (3655368945).

Almost surely, 2^23556821945 is an apocalyptic number.

It is an amenable number.

23556821945 is a deficient number, since it is larger than the sum of its proper divisors (5686129615).

23556821945 is a wasteful number, since it uses less digits than its factorization.

23556821945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162460875.

The product of its digits is 2592000, while the sum is 50.

The spelling of 23556821945 in words is "twenty-three billion, five hundred fifty-six million, eight hundred twenty-one thousand, nine hundred forty-five".