6520061643 has 32 divisors (see below), whose sum is σ = 9256550400. Its totient is φ = 4073097600.

The previous prime is 6520061627. The next prime is 6520061657. The reversal of 6520061643 is 3461600256.

It is not a de Polignac number, because 6520061643 - 2⁴ = 6520061627 is a prime.

It is a super-2 number, since 2×6520061643² = 85022407657039718898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6520061683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4208433 + ... + 4209981.

It is an arithmetic number, because the mean of its divisors is an integer number (289267200).

Almost surely, 2^6520061643 is an apocalyptic number.

6520061643 is a deficient number, since it is larger than the sum of its proper divisors (2736488757).

6520061643 is a wasteful number, since it uses less digits than its factorization.

6520061643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 6520061643 is about 80746.8986587101. The cubic root of 6520061643 is about 1868.1736143348.

Adding to 6520061643 its reverse (3461600256), we get a palindrome (9981661899).

The spelling of 6520061643 in words is "six billion, five hundred twenty million, sixty-one thousand, six hundred forty-three".