6605522121656 has 16 divisors (see below), whose sum is σ = 12588392568840. Its totient is φ = 3248617436640.

The previous prime is 6605522121629. The next prime is 6605522121689. The reversal of 6605522121656 is 6561212255066.

It is a self number, because there is not a number n which added to its sum of digits gives 6605522121656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6767952506 + ... + 6767953481.

Almost surely, 2^{6605522121656} is an apocalyptic number.

It is an amenable number.

6605522121656 is a deficient number, since it is larger than the sum of its proper divisors (5982870447184).

6605522121656 is a wasteful number, since it uses less digits than its factorization.

6605522121656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13535906054 (or 13535906050 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 6605522121656 in words is "six trillion, six hundred five billion, five hundred twenty-two million, one hundred twenty-one thousand, six hundred fifty-six".