6645262253616 has 200 divisors, whose sum is σ = 22395669826464. Its totient is φ = 1862822707200.

The previous prime is 6645262253543. The next prime is 6645262253633. The reversal of 6645262253616 is 6163522625466.

6645262253616 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 2 + 622 + 5 + 3 + 6 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 39 ways as a sum of consecutive naturals, for example, 6429585 + ... + 7391216.

Almost surely, 2^{6645262253616} is an apocalyptic number.

It is an amenable number.

6645262253616 is an abundant number, since it is smaller than the sum of its proper divisors (15750407572848).

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

6645262253616 is a wasteful number, since it uses less digits than its factorization.

6645262253616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13820881 (or 13820866 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The spelling of 6645262253616 in words is "six trillion, six hundred forty-five billion, two hundred sixty-two million, two hundred fifty-three thousand, six hundred sixteen".