66170640473 has 4 divisors (see below), whose sum is σ = 75623589120. Its totient is φ = 56717691828.

The previous prime is 66170640451. The next prime is 66170640517. The reversal of 66170640473 is 37404607166.

66170640473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37404607166 = 2 ⋅18702303583.

It is not a de Polignac number, because 66170640473 - 2¹² = 66170636377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66170640443) 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, 4726474313 + ... + 4726474326.

It is an arithmetic number, because the mean of its divisors is an integer number (18905897280).

Almost surely, 2^66170640473 is an apocalyptic number.

It is an amenable number.

66170640473 is a deficient number, since it is larger than the sum of its proper divisors (9452948647).

66170640473 is an equidigital number, since it uses as much as digits as its factorization.

66170640473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9452948646.

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 66170640473 in words is "sixty-six billion, one hundred seventy million, six hundred forty thousand, four hundred seventy-three".