6400165652 has 24 divisors (see below), whose sum is σ = 11241364680. Its totient is φ = 3188366720.

The previous prime is 6400165619. The next prime is 6400165657. The reversal of 6400165652 is 2565610046.

It can be written as a sum of positive squares in 4 ways, for example, as 1348652176 + 5051513476 = 36724^2 + 71074^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400165657) 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 7 ways as a sum of consecutive naturals, for example, 1985402 + ... + 1988622.

It is an arithmetic number, because the mean of its divisors is an integer number (468390195).

Almost surely, 2^6400165652 is an apocalyptic number.

It is an amenable number.

6400165652 is a deficient number, since it is larger than the sum of its proper divisors (4841199028).

6400165652 is a wasteful number, since it uses less digits than its factorization.

6400165652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891 (or 4889 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 6400165652 is about 80001.0353183007. The cubic root of 6400165652 is about 1856.6515518168.

Adding to 6400165652 its reverse (2565610046), we get a palindrome (8965775698).

The spelling of 6400165652 in words is "six billion, four hundred million, one hundred sixty-five thousand, six hundred fifty-two".