66571930 has 8 divisors (see below), whose sum is σ = 119829492. Its totient is φ = 26628768.

The previous prime is 66571919. The next prime is 66571931. The reversal of 66571930 is 3917566.

It can be written as a sum of positive squares in 2 ways, for example, as 62583921 + 3988009 = 7911^2 + 1997^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66571930.

It is not an unprimeable number, because it can be changed into a prime (66571931) 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, 3328587 + ... + 3328606.

Almost surely, 2^66571930 is an apocalyptic number.

66571930 is a deficient number, since it is larger than the sum of its proper divisors (53257562).

66571930 is a wasteful number, since it uses less digits than its factorization.

66571930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657200.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 66571930 is about 8159.1623344557. The cubic root of 66571930 is about 405.2879728053.

The spelling of 66571930 in words is "sixty-six million, five hundred seventy-one thousand, nine hundred thirty".