23778007866 has 16 divisors (see below), whose sum is σ = 52840017600. Its totient is φ = 7926002604.

The previous prime is 23778007823. The next prime is 23778007871. The reversal of 23778007866 is 66870087732.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 440333479 = 23778007866 / (2 + 3 + 7 + 7 + 8 + 0 + 0 + 7 + 8 + 6 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220166686 + ... + 220166793.

It is an arithmetic number, because the mean of its divisors is an integer number (3302501100).

Almost surely, 2^23778007866 is an apocalyptic number.

23778007866 is an abundant number, since it is smaller than the sum of its proper divisors (29062009734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23778007866 is a wasteful number, since it uses less digits than its factorization.

23778007866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440333490 (or 440333484 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 23778007866 in words is "twenty-three billion, seven hundred seventy-eight million, seven thousand, eight hundred sixty-six".