65681479 has 4 divisors (see below), whose sum is σ = 66198784. Its totient is φ = 65164176.

The previous prime is 65681477. The next prime is 65681503. The reversal of 65681479 is 97418656.

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 65681479 - 2¹ = 65681477 is a prime.

It is a super-4 number, since 4×65681479⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65681477) 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, 258462 + ... + 258715.

It is an arithmetic number, because the mean of its divisors is an integer number (16549696).

Almost surely, 2^65681479 is an apocalyptic number.

65681479 is a deficient number, since it is larger than the sum of its proper divisors (517305).

65681479 is a wasteful number, since it uses less digits than its factorization.

65681479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517304.

The product of its digits is 362880, while the sum is 46.

The square root of 65681479 is about 8104.4110828610. The cubic root of 65681479 is about 403.4728424043.

The spelling of 65681479 in words is "sixty-five million, six hundred eighty-one thousand, four hundred seventy-nine".