6601864398 has 16 divisors (see below), whose sum is σ = 13253936256. Its totient is φ = 2192253560.

The previous prime is 6601864397. The next prime is 6601864411. The reversal of 6601864398 is 8934681066.

It is a super-2 number, since 2×6601864398² = 87169227059159804808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6601864398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6601864397) 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, 2090268 + ... + 2093423.

It is an arithmetic number, because the mean of its divisors is an integer number (828371016).

Almost surely, 2^6601864398 is an apocalyptic number.

6601864398 is an abundant number, since it is smaller than the sum of its proper divisors (6652071858).

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

6601864398 is a wasteful number, since it uses less digits than its factorization.

6601864398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183959.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 6601864398 is about 81251.8578126064. The cubic root of 6601864398 is about 1875.9540647854.

The spelling of 6601864398 in words is "six billion, six hundred one million, eight hundred sixty-four thousand, three hundred ninety-eight".