66546660643 has 8 divisors (see below), whose sum is σ = 68564136416. Its totient is φ = 64559073600.

The previous prime is 66546660641. The next prime is 66546660709. The reversal of 66546660643 is 34606664566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66546660643 - 2¹ = 66546660641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66546660641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7467663 + ... + 7476568.

It is an arithmetic number, because the mean of its divisors is an integer number (8570517052).

Almost surely, 2^66546660643 is an apocalyptic number.

66546660643 is a deficient number, since it is larger than the sum of its proper divisors (2017475773).

66546660643 is a wasteful number, since it uses less digits than its factorization.

66546660643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14944365.

The product of its (nonzero) digits is 11197440, while the sum is 52.

The spelling of 66546660643 in words is "sixty-six billion, five hundred forty-six million, six hundred sixty thousand, six hundred forty-three".