5215220664 has 64 divisors (see below), whose sum is σ = 13384707840. Its totient is φ = 1692368640.

The previous prime is 5215220663. The next prime is 5215220671. The reversal of 5215220664 is 4660225125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5215220663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473767 + ... + 484649.

It is an arithmetic number, because the mean of its divisors is an integer number (209136060).

Almost surely, 2^5215220664 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 5215220664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6692353920).

5215220664 is an abundant number, since it is smaller than the sum of its proper divisors (8169487176).

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

5215220664 is a wasteful number, since it uses less digits than its factorization.

5215220664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11420 (or 11416 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 5215220664 is about 72216.4847109024. The cubic root of 5215220664 is about 1734.1669146709.

Adding to 5215220664 its reverse (4660225125), we get a palindrome (9875445789).

The spelling of 5215220664 in words is "five billion, two hundred fifteen million, two hundred twenty thousand, six hundred sixty-four".