6509943870 has 16 divisors (see below), whose sum is σ = 15623865360. Its totient is φ = 1735985024.

The previous prime is 6509943857. The next prime is 6509943871. The reversal of 6509943870 is 783499056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6509943871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108499035 + ... + 108499094.

It is an arithmetic number, because the mean of its divisors is an integer number (976491585).

Almost surely, 2^6509943870 is an apocalyptic number.

6509943870 is an abundant number, since it is smaller than the sum of its proper divisors (9113921490).

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

6509943870 is a wasteful number, since it uses less digits than its factorization.

6509943870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216998139.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 6509943870 is about 80684.2231790082. The cubic root of 6509943870 is about 1867.2067757158.

The spelling of 6509943870 in words is "six billion, five hundred nine million, nine hundred forty-three thousand, eight hundred seventy".