65519999999 has 4 divisors (see below), whose sum is σ = 69374117664. Its totient is φ = 61665882336.

The previous prime is 65519999917. The next prime is 65520000047. The reversal of 65519999999 is 99999991556.

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 65519999999 - 2³² = 61225032703 is a prime.

It is a Duffinian number.

65519999999 is a modest number, since divided by 999999 gives 65519 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65519990999) 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, 1927058807 + ... + 1927058840.

It is an arithmetic number, because the mean of its divisors is an integer number (17343529416).

Almost surely, 2^65519999999 is an apocalyptic number.

65519999999 is a deficient number, since it is larger than the sum of its proper divisors (3854117665).

65519999999 is a wasteful number, since it uses less digits than its factorization.

65519999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3854117664.

The product of its digits is 717445350, while the sum is 80.

The spelling of 65519999999 in words is "sixty-five billion, five hundred nineteen million, nine hundred ninety-nine thousand, nine hundred ninety-nine".