66898063 has 4 divisors (see below), whose sum is σ = 67116280. Its totient is φ = 66679848.

The previous prime is 66898001. The next prime is 66898081. The reversal of 66898063 is 36089866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36089866 = 2 ⋅18044933.

It is a cyclic number.

It is not a de Polignac number, because 66898063 - 2¹³ = 66889871 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 (66898463) 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, 108648 + ... + 109261.

It is an arithmetic number, because the mean of its divisors is an integer number (16779070).

Almost surely, 2^66898063 is an apocalyptic number.

66898063 is a deficient number, since it is larger than the sum of its proper divisors (218217).

66898063 is a wasteful number, since it uses less digits than its factorization.

66898063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218216.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 66898063 is about 8179.1236083091. The cubic root of 66898063 is about 405.9487243842.

The spelling of 66898063 in words is "sixty-six million, eight hundred ninety-eight thousand, sixty-three".