66478047663 has 4 divisors (see below), whose sum is σ = 88637396888. Its totient is φ = 44318698440.

The previous prime is 66478047661. The next prime is 66478047673. The reversal of 66478047663 is 36674087466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66478047663 - 2¹ = 66478047661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66478047661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11079674608 + ... + 11079674613.

It is an arithmetic number, because the mean of its divisors is an integer number (22159349222).

Almost surely, 2^66478047663 is an apocalyptic number.

66478047663 is a deficient number, since it is larger than the sum of its proper divisors (22159349225).

66478047663 is a wasteful number, since it uses less digits than its factorization.

66478047663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22159349224.

The product of its (nonzero) digits is 24385536, while the sum is 57.

The spelling of 66478047663 in words is "sixty-six billion, four hundred seventy-eight million, forty-seven thousand, six hundred sixty-three".