23278238657 has 2 divisors, whose sum is σ = 23278238658. Its totient is φ = 23278238656.

The previous prime is 23278238629. The next prime is 23278238693. The reversal of 23278238657 is 75683287232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19834778896 + 3443459761 = 140836^2 + 58681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23278238657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23278238599 and 23278238608.

It is not a weakly prime, because it can be changed into another prime (23278238617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11639119328 + 11639119329.

It is an arithmetic number, because the mean of its divisors is an integer number (11639119329).

Almost surely, 2^23278238657 is an apocalyptic number.

It is an amenable number.

23278238657 is a deficient number, since it is larger than the sum of its proper divisors (1).

23278238657 is an equidigital number, since it uses as much as digits as its factorization.

23278238657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 53.

The spelling of 23278238657 in words is "twenty-three billion, two hundred seventy-eight million, two hundred thirty-eight thousand, six hundred fifty-seven".