66454504857 has 96 divisors (see below), whose sum is σ = 111016563840. Its totient is φ = 37944391680.

The previous prime is 66454504841. The next prime is 66454504931. The reversal of 66454504857 is 75840545466.

66454504857 is a `hidden beast` number, since 6 + 6 + 4 + 54 + 504 + 85 + 7 = 666.

It is not a de Polignac number, because 66454504857 - 2⁴ = 66454504841 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66454505857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 43405182 + ... + 43406712.

It is an arithmetic number, because the mean of its divisors is an integer number (1156422540).

Almost surely, 2^66454504857 is an apocalyptic number.

It is an amenable number.

66454504857 is a deficient number, since it is larger than the sum of its proper divisors (44562058983).

66454504857 is a wasteful number, since it uses less digits than its factorization.

66454504857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863 (or 1860 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 54.

The spelling of 66454504857 in words is "sixty-six billion, four hundred fifty-four million, five hundred four thousand, eight hundred fifty-seven".