66121672 has 32 divisors (see below), whose sum is σ = 131133600. Its totient is φ = 31169664.

The previous prime is 66121669. The next prime is 66121681. The reversal of 66121672 is 27612166.

It is a happy 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, 34483 + ... + 36349.

It is an arithmetic number, because the mean of its divisors is an integer number (4097925).

Almost surely, 2^66121672 is an apocalyptic number.

It is an amenable number.

66121672 is a deficient number, since it is larger than the sum of its proper divisors (65011928).

66121672 is a wasteful number, since it uses less digits than its factorization.

66121672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125 (or 2121 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 66121672 is about 8131.5233505168. The cubic root of 66121672 is about 404.3721858547.

The spelling of 66121672 in words is "sixty-six million, one hundred twenty-one thousand, six hundred seventy-two".