65539978831 has 4 divisors (see below), whose sum is σ = 68389543152. Its totient is φ = 62690414512.

The previous prime is 65539978799. The next prime is 65539978871. The reversal of 65539978831 is 13887993556.

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 65539978831 - 2⁵ = 65539978799 is a prime.

It is a super-2 number, since 2×65539978831² (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 (65539978871) 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, 1424782126 + ... + 1424782171.

It is an arithmetic number, because the mean of its divisors is an integer number (17097385788).

Almost surely, 2^65539978831 is an apocalyptic number.

65539978831 is a deficient number, since it is larger than the sum of its proper divisors (2849564321).

65539978831 is a wasteful number, since it uses less digits than its factorization.

65539978831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849564320.

The product of its digits is 48988800, while the sum is 64.

The spelling of 65539978831 in words is "sixty-five billion, five hundred thirty-nine million, nine hundred seventy-eight thousand, eight hundred thirty-one".