23980515781 has 2 divisors, whose sum is σ = 23980515782. Its totient is φ = 23980515780.

The previous prime is 23980515719. The next prime is 23980515787. The reversal of 23980515781 is 18751508932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18833170756 + 5147345025 = 137234^2 + 71745^2 .

It is a cyclic number.

It is not a de Polignac number, because 23980515781 - 2¹⁹ = 23979991493 is a prime.

It is a super-2 number, since 2×23980515781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23980515787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11990257890 + 11990257891.

It is an arithmetic number, because the mean of its divisors is an integer number (11990257891).

Almost surely, 2^23980515781 is an apocalyptic number.

It is an amenable number.

23980515781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23980515781 is an equidigital number, since it uses as much as digits as its factorization.

23980515781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 23980515781 in words is "twenty-three billion, nine hundred eighty million, five hundred fifteen thousand, seven hundred eighty-one".