5155221520 has 20 divisors (see below), whose sum is σ = 11985890220. Its totient is φ = 2062088576.

The previous prime is 5155221503. The next prime is 5155221521. The reversal of 5155221520 is 251225515.

It can be written as a sum of positive squares in 2 ways, for example, as 1435197456 + 3720024064 = 37884^2 + 60992^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×5155221520² = 53152617840542220800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5155221521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32220055 + ... + 32220214.

It is an arithmetic number, because the mean of its divisors is an integer number (599294511).

Almost surely, 2^5155221520 is an apocalyptic number.

It is an amenable number.

5155221520 is an abundant number, since it is smaller than the sum of its proper divisors (6830668700).

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

5155221520 is a wasteful number, since it uses less digits than its factorization.

5155221520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64440282 (or 64440276 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 5155221520 is about 71799.8713090769. The cubic root of 5155221520 is about 1727.4909355080.

The spelling of 5155221520 in words is "five billion, one hundred fifty-five million, two hundred twenty-one thousand, five hundred twenty".