66169972 has 12 divisors (see below), whose sum is σ = 126324576. Its totient is φ = 30077240.

The previous prime is 66169969. The next prime is 66169973. The reversal of 66169972 is 27996166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66169973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751888 + ... + 751975.

It is an arithmetic number, because the mean of its divisors is an integer number (10527048).

Almost surely, 2^66169972 is an apocalyptic number.

It is an amenable number.

66169972 is a deficient number, since it is larger than the sum of its proper divisors (60154604).

66169972 is a wasteful number, since it uses less digits than its factorization.

66169972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503878 (or 1503876 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 66169972 is about 8134.4927315721. The cubic root of 66169972 is about 404.4706226822.

The spelling of 66169972 in words is "sixty-six million, one hundred sixty-nine thousand, nine hundred seventy-two".