65628215965 has 32 divisors (see below), whose sum is σ = 85816130400. Its totient is φ = 47890698240.

The previous prime is 65628215911. The next prime is 65628215971. The reversal of 65628215965 is 56951282656.

It can be written as a sum of positive squares in 16 ways, for example, as 43323092164 + 22305123801 = 208142^2 + 149349^2 .

It is not a de Polignac number, because 65628215965 - 2¹³ = 65628207773 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 17173755 + ... + 17177575.

It is an arithmetic number, because the mean of its divisors is an integer number (2681754075).

Almost surely, 2^65628215965 is an apocalyptic number.

65628215965 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65628215965 is a deficient number, since it is larger than the sum of its proper divisors (20187914435).

65628215965 is a wasteful number, since it uses less digits than its factorization.

65628215965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6897.

The product of its digits is 7776000, while the sum is 55.

The spelling of 65628215965 in words is "sixty-five billion, six hundred twenty-eight million, two hundred fifteen thousand, nine hundred sixty-five".