66181672 has 32 divisors (see below), whose sum is σ = 130092480. Its totient is φ = 31504000.

The previous prime is 66181637. The next prime is 66181673. The reversal of 66181672 is 27618166.

It is not an unprimeable number, because it can be changed into a prime (66181673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45468 + ... + 46900.

It is an arithmetic number, because the mean of its divisors is an integer number (4065390).

Almost surely, 2^66181672 is an apocalyptic number.

It is an amenable number.

66181672 is a deficient number, since it is larger than the sum of its proper divisors (63910808).

66181672 is a wasteful number, since it uses less digits than its factorization.

66181672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713 (or 1709 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 66181672 is about 8135.2118595646. The cubic root of 66181672 is about 404.4944604203.

The spelling of 66181672 in words is "sixty-six million, one hundred eighty-one thousand, six hundred seventy-two".