6506039621 has 16 divisors (see below), whose sum is σ = 7082526528. Its totient is φ = 5952441600.

The previous prime is 6506039609. The next prime is 6506039627. The reversal of 6506039621 is 1269306056.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6506039621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6506039627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133151 + ... + 175331.

It is an arithmetic number, because the mean of its divisors is an integer number (442657908).

Almost surely, 2^6506039621 is an apocalyptic number.

It is an amenable number.

6506039621 is a deficient number, since it is larger than the sum of its proper divisors (576486907).

6506039621 is a wasteful number, since it uses less digits than its factorization.

6506039621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42452.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 6506039621 is about 80660.0249256098. The cubic root of 6506039621 is about 1866.8334239027.

The spelling of 6506039621 in words is "six billion, five hundred six million, thirty-nine thousand, six hundred twenty-one".