6520061220 has 24 divisors (see below), whose sum is σ = 18256171584. Its totient is φ = 1738682976.

The previous prime is 6520061209. The next prime is 6520061231. The reversal of 6520061220 is 221600256.

It is an interprime number because it is at equal distance from previous prime (6520061209) and next prime (6520061231).

It is a super-2 number, since 2×6520061220² = 85022396625095776800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54333784 + ... + 54333903.

It is an arithmetic number, because the mean of its divisors is an integer number (760673816).

Almost surely, 2^6520061220 is an apocalyptic number.

6520061220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6520061220 is an abundant number, since it is smaller than the sum of its proper divisors (11736110364).

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

6520061220 is a wasteful number, since it uses less digits than its factorization.

6520061220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108667699 (or 108667697 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 6520061220 is about 80746.8960394144. The cubic root of 6520061220 is about 1868.1735739345.

Adding to 6520061220 its reverse (221600256), we get a palindrome (6741661476).

The spelling of 6520061220 in words is "six billion, five hundred twenty million, sixty-one thousand, two hundred twenty".