66686450160 has 80 divisors (see below), whose sum is σ = 225521458560. Its totient is φ = 16166411520.

The previous prime is 66686450153. The next prime is 66686450189. The reversal of 66686450160 is 6105468666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12627370 + ... + 12632649.

It is an arithmetic number, because the mean of its divisors is an integer number (2819018232).

Almost surely, 2^66686450160 is an apocalyptic number.

66686450160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66686450160 is an abundant number, since it is smaller than the sum of its proper divisors (158835008400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66686450160 is a wasteful number, since it uses less digits than its factorization.

66686450160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25260046 (or 25260040 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 66686450160 in words is "sixty-six billion, six hundred eighty-six million, four hundred fifty thousand, one hundred sixty".