23278078715666 has 32 divisors (see below), whose sum is σ = 36590198791680. Its totient is φ = 11085656184064.

The previous prime is 23278078715621. The next prime is 23278078715669. The reversal of 23278078715666 is 66651787087232.

It is a junction number, because it is equal to n+sod(n) for n = 23278078715596 and 23278078715605.

It is not an unprimeable number, because it can be changed into a prime (23278078715669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181919726 + ... + 182047638.

It is an arithmetic number, because the mean of its divisors is an integer number (1143443712240).

Almost surely, 2^{23278078715666} is an apocalyptic number.

23278078715666 is a deficient number, since it is larger than the sum of its proper divisors (13312120076014).

23278078715666 is a wasteful number, since it uses less digits than its factorization.

23278078715666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144730.

The product of its (nonzero) digits is 284497920, while the sum is 68.

The spelling of 23278078715666 in words is "twenty-three trillion, two hundred seventy-eight billion, seventy-eight million, seven hundred fifteen thousand, six hundred sixty-six".