66170471644 has 24 divisors (see below), whose sum is σ = 121633279488. Its totient is φ = 31437159600.

The previous prime is 66170471639. The next prime is 66170471669. The reversal of 66170471644 is 44617407166.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 66170471594 and 66170471603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2367712 + ... + 2395495.

It is an arithmetic number, because the mean of its divisors is an integer number (5068053312).

Almost surely, 2^66170471644 is an apocalyptic number.

It is an amenable number.

66170471644 is a deficient number, since it is larger than the sum of its proper divisors (55462807844).

66170471644 is a wasteful number, since it uses less digits than its factorization.

66170471644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763385 (or 4763383 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 46.

The spelling of 66170471644 in words is "sixty-six billion, one hundred seventy million, four hundred seventy-one thousand, six hundred forty-four".