66972449160 has 80 divisors (see below), whose sum is σ = 225101853900. Its totient is φ = 17859318912.

The previous prime is 66972449153. The next prime is 66972449227. The reversal of 66972449160 is 6194427966.

It is a happy number.

66972449160 is a `hidden beast` number, since 6 + 6 + 97 + 2 + 4 + 491 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63531218916 + 3441230244 = 252054^2 + 58662^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 66972449097 and 66972449106.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10332015 + ... + 10338494.

Almost surely, 2^66972449160 is an apocalyptic number.

66972449160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66972449160 is an abundant number, since it is smaller than the sum of its proper divisors (158129404740).

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

66972449160 is a wasteful number, since it uses less digits than its factorization.

66972449160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20670532 (or 20670519 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 66972449160 in words is "sixty-six billion, nine hundred seventy-two million, four hundred forty-nine thousand, one hundred sixty".