6601855867 has 4 divisors (see below), whose sum is σ = 6605991376. Its totient is φ = 6597720360.

The previous prime is 6601855847. The next prime is 6601855877. The reversal of 6601855867 is 7685581066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7685581066 = 2 ⋅3842790533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6601855867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6601855817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065359 + ... + 2068552.

It is an arithmetic number, because the mean of its divisors is an integer number (1651497844).

Almost surely, 2^6601855867 is an apocalyptic number.

6601855867 is a deficient number, since it is larger than the sum of its proper divisors (4135509).

6601855867 is a wasteful number, since it uses less digits than its factorization.

6601855867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135508.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The square root of 6601855867 is about 81251.8053153282. The cubic root of 6601855867 is about 1875.9532567424.

The spelling of 6601855867 in words is "six billion, six hundred one million, eight hundred fifty-five thousand, eight hundred sixty-seven".