6649902785736 has 320 divisors, whose sum is σ = 21606840288000. Its totient is φ = 1871450542080.

The previous prime is 6649902785731. The next prime is 6649902785761. The reversal of 6649902785736 is 6375872099466.

6649902785736 is a `hidden beast` number, since 6 + 6 + 49 + 9 + 0 + 2 + 7 + 8 + 573 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (6649902785731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 363592080 + ... + 363610368.

It is an arithmetic number, because the mean of its divisors is an integer number (67521375900).

Almost surely, 2^{6649902785736} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6649902785736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10803420144000).

6649902785736 is an abundant number, since it is smaller than the sum of its proper divisors (14956937502264).

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

6649902785736 is a wasteful number, since it uses less digits than its factorization.

6649902785736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19514 (or 19501 counting only the distinct ones).

The product of its (nonzero) digits is 823011840, while the sum is 72.

The spelling of 6649902785736 in words is "six trillion, six hundred forty-nine billion, nine hundred two million, seven hundred eighty-five thousand, seven hundred thirty-six".