66400321258173 has 8 divisors (see below), whose sum is σ = 101181441917248. Its totient is φ = 37943040718944.

The previous prime is 66400321258121. The next prime is 66400321258217. The reversal of 66400321258173 is 37185212300466.

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

It is not a de Polignac number, because 66400321258173 - 2²⁴ = 66400304480957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66400321258573) 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, 1580960029936 + ... + 1580960029977.

It is an arithmetic number, because the mean of its divisors is an integer number (12647680239656).

Almost surely, 2^{66400321258173} is an apocalyptic number.

It is an amenable number.

66400321258173 is a deficient number, since it is larger than the sum of its proper divisors (34781120659075).

66400321258173 is a wasteful number, since it uses less digits than its factorization.

66400321258173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161920059923.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 66400321258173 in words is "sixty-six trillion, four hundred billion, three hundred twenty-one million, two hundred fifty-eight thousand, one hundred seventy-three".