65578433231 has 4 divisors (see below), whose sum is σ = 65580543792. Its totient is φ = 65576322672.

The previous prime is 65578433227. The next prime is 65578433273. The reversal of 65578433231 is 13233487556.

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 65578433231 - 2² = 65578433227 is a prime.

It is a super-2 number, since 2×65578433231² (a number of 22 digits) contains 22 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 (65578433831) 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, 1007966 + ... + 1071051.

It is an arithmetic number, because the mean of its divisors is an integer number (16395135948).

Almost surely, 2^65578433231 is an apocalyptic number.

65578433231 is a deficient number, since it is larger than the sum of its proper divisors (2110561).

65578433231 is a wasteful number, since it uses less digits than its factorization.

65578433231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110560.

The product of its digits is 1814400, while the sum is 47.

The spelling of 65578433231 in words is "sixty-five billion, five hundred seventy-eight million, four hundred thirty-three thousand, two hundred thirty-one".