6550631421 has 16 divisors (see below), whose sum is σ = 9139438080. Its totient is φ = 4168316160.

The previous prime is 6550631401. The next prime is 6550631429. The reversal of 6550631421 is 1241360556.

It is not a de Polignac number, because 6550631421 - 2¹⁰ = 6550630397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6550631429) 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, 475656 + ... + 489233.

It is an arithmetic number, because the mean of its divisors is an integer number (571214880).

Almost surely, 2^6550631421 is an apocalyptic number.

It is an amenable number.

6550631421 is a deficient number, since it is larger than the sum of its proper divisors (2588806659).

6550631421 is a wasteful number, since it uses less digits than its factorization.

6550631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964996.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 6550631421 is about 80935.9711191507. The cubic root of 6550631421 is about 1871.0887519158.

Adding to 6550631421 its reverse (1241360556), we get a palindrome (7791991977).

The spelling of 6550631421 in words is "six billion, five hundred fifty million, six hundred thirty-one thousand, four hundred twenty-one".