65496437721 has 24 divisors (see below), whose sum is σ = 111145472256. Its totient is φ = 36641363040.

The previous prime is 65496437701. The next prime is 65496437723. The reversal of 65496437721 is 12773469456.

65496437721 is a `hidden beast` number, since 6 + 54 + 96 + 437 + 72 + 1 = 666.

It is not a de Polignac number, because 65496437721 - 2¹³ = 65496429529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65496437723) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 25444105 + ... + 25446678.

It is an arithmetic number, because the mean of its divisors is an integer number (4631061344).

Almost surely, 2^65496437721 is an apocalyptic number.

It is an amenable number.

65496437721 is a deficient number, since it is larger than the sum of its proper divisors (45649034535).

65496437721 is a wasteful number, since it uses less digits than its factorization.

65496437721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50890813 (or 50890810 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 65496437721 in words is "sixty-five billion, four hundred ninety-six million, four hundred thirty-seven thousand, seven hundred twenty-one".