65996129 has 4 divisors (see below), whose sum is σ = 66015684. Its totient is φ = 65976576.

The previous prime is 65996113. The next prime is 65996143. The reversal of 65996129 is 92169956.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23746129 + 42250000 = 4873^2 + 6500^2 .

It is a cyclic number.

It is not a de Polignac number, because 65996129 - 2⁴ = 65996113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65996149) 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, 3272 + ... + 11945.

It is an arithmetic number, because the mean of its divisors is an integer number (16503921).

Almost surely, 2^65996129 is an apocalyptic number.

It is an amenable number.

65996129 is a deficient number, since it is larger than the sum of its proper divisors (19555).

65996129 is a wasteful number, since it uses less digits than its factorization.

65996129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19554.

The product of its digits is 262440, while the sum is 47.

The square root of 65996129 is about 8123.8001575617. The cubic root of 65996129 is about 404.1161010794.

The spelling of 65996129 in words is "sixty-five million, nine hundred ninety-six thousand, one hundred twenty-nine".