23874487561 has 2 divisors, whose sum is σ = 23874487562. Its totient is φ = 23874487560.

The previous prime is 23874487543. The next prime is 23874487573. The reversal of 23874487561 is 16578447832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22340981961 + 1533505600 = 149469^2 + 39160^2 .

It is a cyclic number.

It is not a de Polignac number, because 23874487561 - 2⁷ = 23874487433 is a prime.

It is not a weakly prime, because it can be changed into another prime (23874485561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11937243780 + 11937243781.

It is an arithmetic number, because the mean of its divisors is an integer number (11937243781).

Almost surely, 2^23874487561 is an apocalyptic number.

It is an amenable number.

23874487561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23874487561 is an equidigital number, since it uses as much as digits as its factorization.

23874487561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 55.

The spelling of 23874487561 in words is "twenty-three billion, eight hundred seventy-four million, four hundred eighty-seven thousand, five hundred sixty-one".