66869679 has 16 divisors (see below), whose sum is σ = 93506400. Its totient is φ = 42448896.

The previous prime is 66869669. The next prime is 66869689. The reversal of 66869679 is 97696866.

It is an interprime number because it is at equal distance from previous prime (66869669) and next prime (66869689).

It is not a de Polignac number, because 66869679 - 2⁸ = 66869423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66869659) 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, 1087 + ... + 11615.

It is an arithmetic number, because the mean of its divisors is an integer number (5844150).

Almost surely, 2^66869679 is an apocalyptic number.

66869679 is a deficient number, since it is larger than the sum of its proper divisors (26636721).

66869679 is a wasteful number, since it uses less digits than its factorization.

66869679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634.

The product of its digits is 5878656, while the sum is 57.

The square root of 66869679 is about 8177.3882749934. The cubic root of 66869679 is about 405.8913032967.

The spelling of 66869679 in words is "sixty-six million, eight hundred sixty-nine thousand, six hundred seventy-nine".