6601604381 has 4 divisors (see below), whose sum is σ = 6762619164. Its totient is φ = 6440589600.

The previous prime is 6601604377. The next prime is 6601604393. The reversal of 6601604381 is 1834061066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2906180281 + 3695424100 = 53909^2 + 60790^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601604381 - 2² = 6601604377 is a prime.

It is a super-2 number, since 2×6601604381² = 87162360806476786322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6601604311) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 80507330 + ... + 80507411.

It is an arithmetic number, because the mean of its divisors is an integer number (1690654791).

Almost surely, 2^6601604381 is an apocalyptic number.

It is an amenable number.

6601604381 is a deficient number, since it is larger than the sum of its proper divisors (161014783).

6601604381 is a wasteful number, since it uses less digits than its factorization.

6601604381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161014782.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 6601604381 is about 81250.2577288220. The cubic root of 6601604381 is about 1875.9294360683.

The spelling of 6601604381 in words is "six billion, six hundred one million, six hundred four thousand, three hundred eighty-one".