6641502420 has 48 divisors (see below), whose sum is σ = 21252809088. Its totient is φ = 1518057600.

The previous prime is 6641502401. The next prime is 6641502433. The reversal of 6641502420 is 242051466.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7906131 + ... + 7906970.

It is an arithmetic number, because the mean of its divisors is an integer number (442766856).

Almost surely, 2^6641502420 is an apocalyptic number.

6641502420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6641502420 is an abundant number, since it is smaller than the sum of its proper divisors (14611306668).

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

6641502420 is a wasteful number, since it uses less digits than its factorization.

6641502420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15813120 (or 15813118 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 6641502420 is about 81495.4134905763. The cubic root of 6641502420 is about 1879.7010257179.

Adding to 6641502420 its reverse (242051466), we get a palindrome (6883553886).

The spelling of 6641502420 in words is "six billion, six hundred forty-one million, five hundred two thousand, four hundred twenty".