66923530 has 8 divisors (see below), whose sum is σ = 120462372. Its totient is φ = 26769408.

The previous prime is 66923489. The next prime is 66923533. The reversal of 66923530 is 3532966.

It can be written as a sum of positive squares in 2 ways, for example, as 66732561 + 190969 = 8169^2 + 437^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66923533) 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, 3346167 + ... + 3346186.

Almost surely, 2^66923530 is an apocalyptic number.

66923530 is a deficient number, since it is larger than the sum of its proper divisors (53538842).

66923530 is a wasteful number, since it uses less digits than its factorization.

66923530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6692360.

The product of its (nonzero) digits is 29160, while the sum is 34.

The square root of 66923530 is about 8180.6802895603. The cubic root of 66923530 is about 406.0002305320. Note that the first 3 decimals are identical.

The spelling of 66923530 in words is "sixty-six million, nine hundred twenty-three thousand, five hundred thirty".