6621550655 has 8 divisors (see below), whose sum is σ = 7974547872. Its totient is φ = 5278115808.

The previous prime is 6621550633. The next prime is 6621550669. The reversal of 6621550655 is 5560551266.

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

It is a cyclic number.

It is not a de Polignac number, because 6621550655 - 2⁶ = 6621550591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389067 + ... + 2391836.

It is an arithmetic number, because the mean of its divisors is an integer number (996818484).

Almost surely, 2^6621550655 is an apocalyptic number.

6621550655 is a deficient number, since it is larger than the sum of its proper divisors (1352997217).

6621550655 is a wasteful number, since it uses less digits than its factorization.

6621550655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781185.

The product of its (nonzero) digits is 270000, while the sum is 41.

The square root of 6621550655 is about 81372.9110638178. The cubic root of 6621550655 is about 1877.8168651659.

The spelling of 6621550655 in words is "six billion, six hundred twenty-one million, five hundred fifty thousand, six hundred fifty-five".