65531213556 has 72 divisors (see below), whose sum is σ = 162580755456. Its totient is φ = 20539699200.

The previous prime is 65531213483. The next prime is 65531213581.

65531213556 is nontrivially palindromic in base 10.

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 23 ways as a sum of consecutive naturals, for example, 3983460 + ... + 3999876.

It is an arithmetic number, because the mean of its divisors is an integer number (2258066048).

Almost surely, 2^65531213556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65531213556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81290377728).

65531213556 is an abundant number, since it is smaller than the sum of its proper divisors (97049541900).

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

65531213556 is a wasteful number, since it uses less digits than its factorization.

65531213556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17609 (or 17590 counting only the distinct ones).

The product of its digits is 405000, while the sum is 42.

The spelling of 65531213556 in words is "sixty-five billion, five hundred thirty-one million, two hundred thirteen thousand, five hundred fifty-six".