6521998947 has 8 divisors (see below), whose sum is σ = 8782098000. Its totient is φ = 4304949600.

The previous prime is 6521998939. The next prime is 6521998969. The reversal of 6521998947 is 7498991256.

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

It is not a de Polignac number, because 6521998947 - 2³ = 6521998939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6521998937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10762072 + ... + 10762677.

It is an arithmetic number, because the mean of its divisors is an integer number (1097762250).

Almost surely, 2^6521998947 is an apocalyptic number.

6521998947 is a deficient number, since it is larger than the sum of its proper divisors (2260099053).

6521998947 is a wasteful number, since it uses less digits than its factorization.

6521998947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21524853.

The product of its digits is 9797760, while the sum is 60.

The square root of 6521998947 is about 80758.8939188743. The cubic root of 6521998947 is about 1868.3586259708.

The spelling of 6521998947 in words is "six billion, five hundred twenty-one million, nine hundred ninety-eight thousand, nine hundred forty-seven".