6602811981 has 8 divisors (see below), whose sum is σ = 9008487840. Its totient is φ = 4299505392.

The previous prime is 6602811977. The next prime is 6602811997. The reversal of 6602811981 is 1891182066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6602811981 - 2² = 6602811977 is a prime.

It is a super-2 number, since 2×6602811981² = 87194252112874288722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6602811911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25592166 + ... + 25592423.

It is an arithmetic number, because the mean of its divisors is an integer number (1126060980).

Almost surely, 2^6602811981 is an apocalyptic number.

It is an amenable number.

6602811981 is a deficient number, since it is larger than the sum of its proper divisors (2405675859).

6602811981 is a wasteful number, since it uses less digits than its factorization.

6602811981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51184635.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 6602811981 is about 81257.6887500500. The cubic root of 6602811981 is about 1876.0438140356.

The spelling of 6602811981 in words is "six billion, six hundred two million, eight hundred eleven thousand, nine hundred eighty-one".