6640059621 has 8 divisors (see below), whose sum is σ = 9534444640. Its totient is φ = 4086190512.

The previous prime is 6640059577. The next prime is 6640059653. The reversal of 6640059621 is 1269500466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6640059621 - 2¹¹ = 6640057573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 170257939 = 6640059621 / (6 + 6 + 4 + 0 + 0 + 5 + 9 + 6 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6640059621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640059821) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 85128931 + ... + 85129008.

It is an arithmetic number, because the mean of its divisors is an integer number (1191805580).

Almost surely, 2^6640059621 is an apocalyptic number.

It is an amenable number.

6640059621 is a deficient number, since it is larger than the sum of its proper divisors (2894385019).

6640059621 is a wasteful number, since it uses less digits than its factorization.

6640059621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170257955.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 6640059621 is about 81486.5609840052. The cubic root of 6640059621 is about 1879.5649005362.

The spelling of 6640059621 in words is "six billion, six hundred forty million, fifty-nine thousand, six hundred twenty-one".