6421593993 has 16 divisors (see below), whose sum is σ = 8683531776. Its totient is φ = 4220415360.

The previous prime is 6421593947. The next prime is 6421594009. The reversal of 6421593993 is 3993951246.

It is not a de Polignac number, because 6421593993 - 2¹² = 6421589897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6421593193) 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, 561771 + ... + 573087.

It is an arithmetic number, because the mean of its divisors is an integer number (542720736).

Almost surely, 2^6421593993 is an apocalyptic number.

It is an amenable number.

6421593993 is a deficient number, since it is larger than the sum of its proper divisors (2261937783).

6421593993 is a wasteful number, since it uses less digits than its factorization.

6421593993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13984.

The product of its digits is 1574640, while the sum is 51.

The square root of 6421593993 is about 80134.8488049987. The cubic root of 6421593993 is about 1858.7213234395.

The spelling of 6421593993 in words is "six billion, four hundred twenty-one million, five hundred ninety-three thousand, nine hundred ninety-three".