66563891090 has 32 divisors (see below), whose sum is σ = 120609651456. Its totient is φ = 26449130880.

The previous prime is 66563891089. The next prime is 66563891113. The reversal of 66563891090 is 9019836566.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3709079 + ... + 3726981.

It is an arithmetic number, because the mean of its divisors is an integer number (3769051608).

Almost surely, 2^66563891090 is an apocalyptic number.

66563891090 is a deficient number, since it is larger than the sum of its proper divisors (54045760366).

66563891090 is a wasteful number, since it uses less digits than its factorization.

66563891090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20354.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 66563891090 in words is "sixty-six billion, five hundred sixty-three million, eight hundred ninety-one thousand, ninety".