6642545500 has 24 divisors (see below), whose sum is σ = 14507320464. Its totient is φ = 2657018000.

The previous prime is 6642545489. The next prime is 6642545551. The reversal of 6642545500 is 55452466.

It is a self number, because there is not a number n which added to its sum of digits gives 6642545500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6642046 + ... + 6643045.

It is an arithmetic number, because the mean of its divisors is an integer number (604471686).

Almost surely, 2^6642545500 is an apocalyptic number.

It is an amenable number.

6642545500 is an abundant number, since it is smaller than the sum of its proper divisors (7864774964).

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

6642545500 is a wasteful number, since it uses less digits than its factorization.

6642545500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13285110 (or 13285098 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 6642545500 is about 81501.8128632732. The cubic root of 6642545500 is about 1879.7994259385.

Adding to 6642545500 its reverse (55452466), we get a palindrome (6697997966).

The spelling of 6642545500 in words is "six billion, six hundred forty-two million, five hundred forty-five thousand, five hundred".