66923514 has 72 divisors (see below), whose sum is σ = 176061600. Its totient is φ = 18284112.

The previous prime is 66923489. The next prime is 66923533. The reversal of 66923514 is 41532966.

It is a happy number.

It is a super-2 number, since 2×66923514² = 8957513452216392, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18637 + ... + 21935.

It is an arithmetic number, because the mean of its divisors is an integer number (2445300).

Almost surely, 2^66923514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66923514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88030800).

66923514 is an abundant number, since it is smaller than the sum of its proper divisors (109138086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66923514 is a wasteful number, since it uses less digits than its factorization.

66923514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344 (or 3334 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 66923514 is about 8180.6793116464. The cubic root of 66923514 is about 406.0001981767. Note that the first 3 decimals are identical.

The spelling of 66923514 in words is "sixty-six million, nine hundred twenty-three thousand, five hundred fourteen".