65971399 has 8 divisors (see below), whose sum is σ = 71946560. Its totient is φ = 60124896.

The previous prime is 65971369. The next prime is 65971403. The reversal of 65971399 is 99317956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65971399 - 2⁹ = 65970887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65971309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31092 + ... + 33145.

It is an arithmetic number, because the mean of its divisors is an integer number (8993320).

Almost surely, 2^65971399 is an apocalyptic number.

65971399 is a deficient number, since it is larger than the sum of its proper divisors (5975161).

65971399 is a wasteful number, since it uses less digits than its factorization.

65971399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64329.

The product of its digits is 459270, while the sum is 49.

The square root of 65971399 is about 8122.2779440253. The cubic root of 65971399 is about 404.0656181199.

The spelling of 65971399 in words is "sixty-five million, nine hundred seventy-one thousand, three hundred ninety-nine".