23821453852561 has 4 divisors (see below), whose sum is σ = 23837871120624. Its totient is φ = 23805036584500.

The previous prime is 23821453852543. The next prime is 23821453852583. The reversal of 23821453852561 is 16525835412832.

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 23821453852561 - 2²³ = 23821445463953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23821453852061) 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, 8208631855 + ... + 8208634756.

It is an arithmetic number, because the mean of its divisors is an integer number (5959467780156).

Almost surely, 2^{23821453852561} is an apocalyptic number.

It is an amenable number.

23821453852561 is a deficient number, since it is larger than the sum of its proper divisors (16417268063).

23821453852561 is a wasteful number, since it uses less digits than its factorization.

23821453852561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16417268062.

The product of its digits is 13824000, while the sum is 55.

The spelling of 23821453852561 in words is "twenty-three trillion, eight hundred twenty-one billion, four hundred fifty-three million, eight hundred fifty-two thousand, five hundred sixty-one".