23603547721261 has 4 divisors (see below), whose sum is σ = 23605920185500. Its totient is φ = 23601175257024.

The previous prime is 23603547721177. The next prime is 23603547721277. The reversal of 23603547721261 is 16212774530632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14510271285225 + 9093276436036 = 3809235^2 + 3015506^2 .

It is a cyclic number.

It is not a de Polignac number, because 23603547721261 - 2²⁵ = 23603514166829 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 (23603547721291) 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, 1186217196 + ... + 1186237093.

It is an arithmetic number, because the mean of its divisors is an integer number (5901480046375).

Almost surely, 2^{23603547721261} is an apocalyptic number.

It is an amenable number.

23603547721261 is a deficient number, since it is larger than the sum of its proper divisors (2372464239).

23603547721261 is an equidigital number, since it uses as much as digits as its factorization.

23603547721261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372464238.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 23603547721261 in words is "twenty-three trillion, six hundred three billion, five hundred forty-seven million, seven hundred twenty-one thousand, two hundred sixty-one".