66924863 has 4 divisors (see below), whose sum is σ = 66991560. Its totient is φ = 66858168.

The previous prime is 66924857. The next prime is 66924889. The reversal of 66924863 is 36842966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36842966 = 2 ⋅18421483.

It is a cyclic number.

It is not a de Polignac number, because 66924863 - 2⁶ = 66924799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66924853) 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, 31820 + ... + 33857.

It is an arithmetic number, because the mean of its divisors is an integer number (16747890).

Almost surely, 2^66924863 is an apocalyptic number.

66924863 is a deficient number, since it is larger than the sum of its proper divisors (66697).

66924863 is a wasteful number, since it uses less digits than its factorization.

66924863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66696.

The product of its digits is 373248, while the sum is 44.

The square root of 66924863 is about 8180.7617615965. The cubic root of 66924863 is about 406.0029261196.

The spelling of 66924863 in words is "sixty-six million, nine hundred twenty-four thousand, eight hundred sixty-three".