6646945734 has 192 divisors, whose sum is σ = 17639451648. Its totient is φ = 1781740800.

The previous prime is 6646945699. The next prime is 6646945751. The reversal of 6646945734 is 4375496466.

It is a happy number.

6646945734 is a `hidden beast` number, since 6 + 6 + 4 + 69 + 4 + 573 + 4 = 666.

Its product of digits (13063680) is a multiple of the sum of its prime divisors (1120).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6761407 + ... + 6762389.

It is an arithmetic number, because the mean of its divisors is an integer number (91872144).

Almost surely, 2^6646945734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646945734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8819725824).

6646945734 is an abundant number, since it is smaller than the sum of its proper divisors (10992505914).

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

6646945734 is a wasteful number, since it uses less digits than its factorization.

6646945734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123 (or 1120 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The square root of 6646945734 is about 81528.8030943666. The cubic root of 6646945734 is about 1880.2144140166.

The spelling of 6646945734 in words is "six billion, six hundred forty-six million, nine hundred forty-five thousand, seven hundred thirty-four".