6642509918 has 16 divisors (see below), whose sum is σ = 10872028656. Its totient is φ = 3018637440.

The previous prime is 6642509879. The next prime is 6642509921. The reversal of 6642509918 is 8199052466.

It is a super-3 number, since 3×6642509918³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

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, 72230 + ... + 136022.

It is an arithmetic number, because the mean of its divisors is an integer number (679501791).

Almost surely, 2^6642509918 is an apocalyptic number.

6642509918 is a deficient number, since it is larger than the sum of its proper divisors (4229518738).

6642509918 is a wasteful number, since it uses less digits than its factorization.

6642509918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68539.

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 6642509918 is about 81501.5945733579. The cubic root of 6642509918 is about 1879.7960694370.

The spelling of 6642509918 in words is "six billion, six hundred forty-two million, five hundred nine thousand, nine hundred eighteen".