6655999961 has 8 divisors (see below), whose sum is σ = 7274985984. Its totient is φ = 6052297680.

The previous prime is 6655999943. The next prime is 6655999963. The reversal of 6655999961 is 1699995566.

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

It is not a de Polignac number, because 6655999961 - 2¹⁸ = 6655737817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6655999963) 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, 3820025 + ... + 3821766.

It is an arithmetic number, because the mean of its divisors is an integer number (909373248).

Almost surely, 2^6655999961 is an apocalyptic number.

It is an amenable number.

6655999961 is a deficient number, since it is larger than the sum of its proper divisors (618986023).

6655999961 is a wasteful number, since it uses less digits than its factorization.

6655999961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7641871.

The product of its digits is 35429400, while the sum is 65.

The square root of 6655999961 is about 81584.3119784680. The cubic root of 6655999961 is about 1881.0677465026.

The spelling of 6655999961 in words is "six billion, six hundred fifty-five million, nine hundred ninety-nine thousand, nine hundred sixty-one".