66986069 has 8 divisors (see below), whose sum is σ = 71158680. Its totient is φ = 62839296.

The previous prime is 66986057. The next prime is 66986081. The reversal of 66986069 is 96068966.

It is an interprime number because it is at equal distance from previous prime (66986057) and next prime (66986081).

It can be written as a sum of positive squares in 4 ways, for example, as 237169 + 66748900 = 487^2 + 8170^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66986069 - 2⁴ = 66986053 is a prime.

It is a super-2 number, since 2×66986069² = 8974266880145522, 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 (66986669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974 + ... + 11615.

It is an arithmetic number, because the mean of its divisors is an integer number (8894835).

Almost surely, 2^66986069 is an apocalyptic number.

It is an amenable number.

66986069 is a deficient number, since it is larger than the sum of its proper divisors (4172611).

66986069 is a wasteful number, since it uses less digits than its factorization.

66986069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12919.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 66986069 is about 8184.5017563686. The cubic root of 66986069 is about 406.1266581298.

The spelling of 66986069 in words is "sixty-six million, nine hundred eighty-six thousand, sixty-nine".