66898501 has 4 divisors (see below), whose sum is σ = 66931072. Its totient is φ = 66865932.

The previous prime is 66898493. The next prime is 66898537. The reversal of 66898501 is 10589866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66898501 - 2³ = 66898493 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 (66898571) 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, 12981 + ... + 17386.

It is an arithmetic number, because the mean of its divisors is an integer number (16732768).

Almost surely, 2^66898501 is an apocalyptic number.

It is an amenable number.

66898501 is a deficient number, since it is larger than the sum of its proper divisors (32571).

66898501 is a wasteful number, since it uses less digits than its factorization.

66898501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32570.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 66898501 is about 8179.1503837501. The cubic root of 66898501 is about 405.9496103349.

The spelling of 66898501 in words is "sixty-six million, eight hundred ninety-eight thousand, five hundred one".