66022993 has 4 divisors (see below), whose sum is σ = 66676788. Its totient is φ = 65369200.

The previous prime is 66022991. The next prime is 66023003. The reversal of 66022993 is 39922066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40043584 + 25979409 = 6328^2 + 5097^2 .

It is a cyclic number.

It is not a de Polignac number, because 66022993 - 2¹ = 66022991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66022991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326746 + ... + 326947.

It is an arithmetic number, because the mean of its divisors is an integer number (16669197).

Almost surely, 2^66022993 is an apocalyptic number.

It is an amenable number.

66022993 is a deficient number, since it is larger than the sum of its proper divisors (653795).

66022993 is a wasteful number, since it uses less digits than its factorization.

66022993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653794.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 66022993 is about 8125.4534027339. The cubic root of 66022993 is about 404.1709260235.

It can be divided in two parts, 660 and 22993, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 66022993 in words is "sixty-six million, twenty-two thousand, nine hundred ninety-three".