23278078715665 has 8 divisors (see below), whose sum is σ = 28221670690920. Its totient is φ = 18430478817792.

The previous prime is 23278078715621. The next prime is 23278078715669. The reversal of 23278078715665 is 56651787087232.

It can be written as a sum of positive squares in 4 ways, for example, as 7083965511184 + 16194113204481 = 2661572^2 + 4024191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23278078715665 - 2¹³ = 23278078707473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23278078715665.

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 7 ways as a sum of consecutive naturals, for example, 23998018810 + ... + 23998019779.

It is an arithmetic number, because the mean of its divisors is an integer number (3527708836365).

Almost surely, 2^{23278078715665} is an apocalyptic number.

It is an amenable number.

23278078715665 is a deficient number, since it is larger than the sum of its proper divisors (4943591975255).

23278078715665 is an equidigital number, since it uses as much as digits as its factorization.

23278078715665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47996038691.

The product of its (nonzero) digits is 237081600, while the sum is 67.

The spelling of 23278078715665 in words is "twenty-three trillion, two hundred seventy-eight billion, seventy-eight million, seven hundred fifteen thousand, six hundred sixty-five".