66829697 has 16 divisors (see below), whose sum is σ = 77856768. Its totient is φ = 56752080.

The previous prime is 66829657. The next prime is 66829699. The reversal of 66829697 is 79692866.

It is not a de Polignac number, because 66829697 - 2¹⁶ = 66764161 is a prime.

It is a super-2 number, since 2×66829697² = 8932416802223618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66829699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7808 + ... + 13950.

It is an arithmetic number, because the mean of its divisors is an integer number (4866048).

Almost surely, 2^66829697 is an apocalyptic number.

It is an amenable number.

66829697 is a deficient number, since it is larger than the sum of its proper divisors (11027071).

66829697 is a wasteful number, since it uses less digits than its factorization.

66829697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6220.

The product of its digits is 1959552, while the sum is 53.

The square root of 66829697 is about 8174.9432413932. The cubic root of 66829697 is about 405.8103917796.

The spelling of 66829697 in words is "sixty-six million, eight hundred twenty-nine thousand, six hundred ninety-seven".