65993251 has 4 divisors (see below), whose sum is σ = 69466600. Its totient is φ = 62519904.

The previous prime is 65993219. The next prime is 65993281. The reversal of 65993251 is 15239956.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 65993251 - 2⁵ = 65993219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65993281) 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 3 ways as a sum of consecutive naturals, for example, 1736646 + ... + 1736683.

It is an arithmetic number, because the mean of its divisors is an integer number (17366650).

Almost surely, 2^65993251 is an apocalyptic number.

65993251 is a deficient number, since it is larger than the sum of its proper divisors (3473349).

65993251 is a wasteful number, since it uses less digits than its factorization.

65993251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3473348.

The product of its digits is 72900, while the sum is 40.

The square root of 65993251 is about 8123.6230217804. The cubic root of 65993251 is about 404.1102266791.

The spelling of 65993251 in words is "sixty-five million, nine hundred ninety-three thousand, two hundred fifty-one".