66551454568 has 32 divisors (see below), whose sum is σ = 126094671360. Its totient is φ = 32927999040.

The previous prime is 66551454551. The next prime is 66551454589. The reversal of 66551454568 is 86545415566.

It is a super-2 number, since 2×66551454568² (a number of 22 digits) contains 22 as substring.

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, 186238 + ... + 409618.

It is an arithmetic number, because the mean of its divisors is an integer number (3940458480).

Almost surely, 2^66551454568 is an apocalyptic number.

It is an amenable number.

66551454568 is a deficient number, since it is larger than the sum of its proper divisors (59543216792).

66551454568 is a wasteful number, since it uses less digits than its factorization.

66551454568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223777 (or 223773 counting only the distinct ones).

The product of its digits is 17280000, while the sum is 55.

The spelling of 66551454568 in words is "sixty-six billion, five hundred fifty-one million, four hundred fifty-four thousand, five hundred sixty-eight".