23278078715621 has 2 divisors, whose sum is σ = 23278078715622. Its totient is φ = 23278078715620.

The previous prime is 23278078715581. The next prime is 23278078715669. The reversal of 23278078715621 is 12651787087232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22777338498721 + 500740216900 = 4772561^2 + 707630^2 .

It is a cyclic number.

It is not a de Polignac number, because 23278078715621 - 2²⁶ = 23278011606757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23278078714621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11639039357810 + 11639039357811.

It is an arithmetic number, because the mean of its divisors is an integer number (11639039357811).

Almost surely, 2^{23278078715621} is an apocalyptic number.

It is an amenable number.

23278078715621 is a deficient number, since it is larger than the sum of its proper divisors (1).

23278078715621 is an equidigital number, since it uses as much as digits as its factorization.

23278078715621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 23278078715621 in words is "twenty-three trillion, two hundred seventy-eight billion, seventy-eight million, seven hundred fifteen thousand, six hundred twenty-one".