6621766426 has 16 divisors (see below), whose sum is σ = 10857703968. Its totient is φ = 3003758800.

The previous prime is 6621766421. The next prime is 6621766433. The reversal of 6621766426 is 6246671266.

It is not an unprimeable number, because it can be changed into a prime (6621766421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295705 + ... + 317308.

It is an arithmetic number, because the mean of its divisors is an integer number (678606498).

Almost surely, 2^6621766426 is an apocalyptic number.

6621766426 is a deficient number, since it is larger than the sum of its proper divisors (4235937542).

6621766426 is a wasteful number, since it uses less digits than its factorization.

6621766426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613517.

The product of its digits is 870912, while the sum is 46.

The square root of 6621766426 is about 81374.2368689255. The cubic root of 6621766426 is about 1877.8372618999.

The spelling of 6621766426 in words is "six billion, six hundred twenty-one million, seven hundred sixty-six thousand, four hundred twenty-six".