66529139 has 4 divisors (see below), whose sum is σ = 67371360. Its totient is φ = 65686920.

The previous prime is 66529129. The next prime is 66529171. The reversal of 66529139 is 93192566.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-66529139 is a prime.

It is a super-2 number, since 2×66529139² = 8852252672162642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66529096 and 66529105.

It is not an unprimeable number, because it can be changed into a prime (66529129) 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, 420992 + ... + 421149.

It is an arithmetic number, because the mean of its divisors is an integer number (16842840).

Almost surely, 2^66529139 is an apocalyptic number.

66529139 is a deficient number, since it is larger than the sum of its proper divisors (842221).

66529139 is an equidigital number, since it uses as much as digits as its factorization.

66529139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842220.

The product of its digits is 87480, while the sum is 41.

The square root of 66529139 is about 8156.5396461980. The cubic root of 66529139 is about 405.2011174055.

The spelling of 66529139 in words is "sixty-six million, five hundred twenty-nine thousand, one hundred thirty-nine".