65221505019 has 16 divisors (see below), whose sum is σ = 105408493440. Its totient is φ = 39528184680.

The previous prime is 65221505017. The next prime is 65221505051. The reversal of 65221505019 is 91050512256.

It is not a de Polignac number, because 65221505019 - 2¹ = 65221505017 is a prime.

It is a super-2 number, since 2×65221505019² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65221505017) 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 15 ways as a sum of consecutive naturals, for example, 109800217 + ... + 109800810.

It is an arithmetic number, because the mean of its divisors is an integer number (6588030840).

Almost surely, 2^65221505019 is an apocalyptic number.

65221505019 is a deficient number, since it is larger than the sum of its proper divisors (40186988421).

65221505019 is a wasteful number, since it uses less digits than its factorization.

65221505019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219601047 (or 219601041 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 65221505019 in words is "sixty-five billion, two hundred twenty-one million, five hundred five thousand, nineteen".