6621773646 has 32 divisors (see below), whose sum is σ = 13825520640. Its totient is φ = 2110348064.

The previous prime is 6621773633. The next prime is 6621773659. The reversal of 6621773646 is 6463771266.

It is an interprime number because it is at equal distance from previous prime (6621773633) and next prime (6621773659).

It is a junction number, because it is equal to n+sod(n) for n = 6621773595 and 6621773604.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 341500 + ... + 360368.

It is an arithmetic number, because the mean of its divisors is an integer number (432047520).

Almost surely, 2^6621773646 is an apocalyptic number.

6621773646 is an abundant number, since it is smaller than the sum of its proper divisors (7203746994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6621773646 is a wasteful number, since it uses less digits than its factorization.

6621773646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21440.

The product of its digits is 1524096, while the sum is 48.

The square root of 6621773646 is about 81374.2812318487. The cubic root of 6621773646 is about 1877.8379443955.

The spelling of 6621773646 in words is "six billion, six hundred twenty-one million, seven hundred seventy-three thousand, six hundred forty-six".