6661364878 has 48 divisors (see below), whose sum is σ = 12014607744. Its totient is φ = 2759037120.

The previous prime is 6661364867. The next prime is 6661364887. The reversal of 6661364878 is 8784631666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4170376 + ... + 4171972.

It is an arithmetic number, because the mean of its divisors is an integer number (250304328).

Almost surely, 2^6661364878 is an apocalyptic number.

6661364878 is a deficient number, since it is larger than the sum of its proper divisors (5353242866).

6661364878 is a wasteful number, since it uses less digits than its factorization.

6661364878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017 (or 3010 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 55.

The square root of 6661364878 is about 81617.1849428783. The cubic root of 6661364878 is about 1881.5730080306.

The spelling of 6661364878 in words is "six billion, six hundred sixty-one million, three hundred sixty-four thousand, eight hundred seventy-eight".