66898069 has 16 divisors (see below), whose sum is σ = 81510400. Its totient is φ = 53627184.

The previous prime is 66898001. The next prime is 66898081. The reversal of 66898069 is 96089866.

It is a cyclic number.

It is not a de Polignac number, because 66898069 - 2¹¹ = 66896021 is a prime.

It is a super-2 number, since 2×66898069² = 8950703271857522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66892069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7324 + ... + 13690.

It is an arithmetic number, because the mean of its divisors is an integer number (5094400).

Almost surely, 2^66898069 is an apocalyptic number.

It is an amenable number.

66898069 is a deficient number, since it is larger than the sum of its proper divisors (14612331).

66898069 is a wasteful number, since it uses less digits than its factorization.

66898069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 66898069 is about 8179.1239750966. The cubic root of 66898069 is about 405.9487365205.

The spelling of 66898069 in words is "sixty-six million, eight hundred ninety-eight thousand, sixty-nine".