6505659774 has 64 divisors (see below), whose sum is σ = 15230073600. Its totient is φ = 2052778464.

The previous prime is 6505659767. The next prime is 6505659803. The reversal of 6505659774 is 4779565056.

6505659774 is a `hidden beast` number, since 6 + 5 + 0 + 565 + 9 + 7 + 74 = 666.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6505659774.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2324544 + ... + 2327340.

It is an arithmetic number, because the mean of its divisors is an integer number (237969900).

Almost surely, 2^6505659774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6505659774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7615036800).

6505659774 is an abundant number, since it is smaller than the sum of its proper divisors (8724413826).

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

6505659774 is a wasteful number, since it uses less digits than its factorization.

6505659774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094 (or 5088 counting only the distinct ones).

The product of its (nonzero) digits is 7938000, while the sum is 54.

The square root of 6505659774 is about 80657.6702738183. The cubic root of 6505659774 is about 1866.7970922828.

The spelling of 6505659774 in words is "six billion, five hundred five million, six hundred fifty-nine thousand, seven hundred seventy-four".