66645374663 has 24 divisors (see below), whose sum is σ = 79490184480. Its totient is φ = 55680065280.

The previous prime is 66645374657. The next prime is 66645374711. The reversal of 66645374663 is 36647354666.

It is a de Polignac number, because none of the positive numbers 2^k-66645374663 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66645374599 and 66645374608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66645374603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2253470 + ... + 2282852.

It is an arithmetic number, because the mean of its divisors is an integer number (3312091020).

Almost surely, 2^66645374663 is an apocalyptic number.

66645374663 is a deficient number, since it is larger than the sum of its proper divisors (12844809817).

66645374663 is a wasteful number, since it uses less digits than its factorization.

66645374663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30567 (or 30560 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 56.

The spelling of 66645374663 in words is "sixty-six billion, six hundred forty-five million, three hundred seventy-four thousand, six hundred sixty-three".