65491039420 has 12 divisors (see below), whose sum is σ = 137531182824. Its totient is φ = 26196415760.

The previous prime is 65491039351. The next prime is 65491039483. The reversal of 65491039420 is 2493019456.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637275966 + ... + 1637276005.

It is an arithmetic number, because the mean of its divisors is an integer number (11460931902).

Almost surely, 2^65491039420 is an apocalyptic number.

It is an amenable number.

65491039420 is an abundant number, since it is smaller than the sum of its proper divisors (72040143404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65491039420 is a wasteful number, since it uses less digits than its factorization.

65491039420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3274551980 (or 3274551978 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 65491039420 in words is "sixty-five billion, four hundred ninety-one million, thirty-nine thousand, four hundred twenty".