23355561261 has 4 divisors (see below), whose sum is σ = 31140748352. Its totient is φ = 15570374172.

The previous prime is 23355561247. The next prime is 23355561269. The reversal of 23355561261 is 16216555332.

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 de Polignac number, because none of the positive numbers 2^k-23355561261 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 (23355561269) 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, 3892593541 + ... + 3892593546.

It is an arithmetic number, because the mean of its divisors is an integer number (7785187088).

Almost surely, 2^23355561261 is an apocalyptic number.

It is an amenable number.

23355561261 is a deficient number, since it is larger than the sum of its proper divisors (7785187091).

23355561261 is an equidigital number, since it uses as much as digits as its factorization.

23355561261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7785187090.

The product of its digits is 162000, while the sum is 39.

The spelling of 23355561261 in words is "twenty-three billion, three hundred fifty-five million, five hundred sixty-one thousand, two hundred sixty-one".