13623616566 has 48 divisors (see below), whose sum is σ = 34062223104. Its totient is φ = 3854667312.

The previous prime is 13623616547. The next prime is 13623616577. The reversal of 13623616566 is 66561632631.

13623616566 is a `hidden beast` number, since 1 + 3 + 6 + 23 + 61 + 6 + 566 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 511896 + ... + 537851.

It is an arithmetic number, because the mean of its divisors is an integer number (709629648).

Almost surely, 2^13623616566 is an apocalyptic number.

13623616566 is an abundant number, since it is smaller than the sum of its proper divisors (20438606538).

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

13623616566 is a wasteful number, since it uses less digits than its factorization.

13623616566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049865 (or 1049862 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The spelling of 13623616566 in words is "thirteen billion, six hundred twenty-three million, six hundred sixteen thousand, five hundred sixty-six".