66921130 has 16 divisors (see below), whose sum is σ = 121126824. Its totient is φ = 26619840.

The previous prime is 66921103. The next prime is 66921131. The reversal of 66921130 is 3112966.

It can be written as a sum of positive squares in 4 ways, for example, as 21372129 + 45549001 = 4623^2 + 6749^2 .

It is not an unprimeable number, because it can be changed into a prime (66921131) 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, 16677 + ... + 20296.

Almost surely, 2^66921130 is an apocalyptic number.

66921130 is a deficient number, since it is larger than the sum of its proper divisors (54205694).

66921130 is a wasteful number, since it uses less digits than its factorization.

66921130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37161.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 66921130 is about 8180.5336011779. The cubic root of 66921130 is about 405.9953771708.

The spelling of 66921130 in words is "sixty-six million, nine hundred twenty-one thousand, one hundred thirty".