6421551246 has 24 divisors (see below), whose sum is σ = 15178212504. Its totient is φ = 1945924560.

The previous prime is 6421551211. The next prime is 6421551247.

6421551246 is a `hidden beast` number, since 64 + 2 + 1 + 551 + 2 + 46 = 666.

6421551246 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6421551246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421551247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16215841 + ... + 16216236.

It is an arithmetic number, because the mean of its divisors is an integer number (632425521).

Almost surely, 2^6421551246 is an apocalyptic number.

6421551246 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6421551246 is an abundant number, since it is smaller than the sum of its proper divisors (8756661258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6421551246 is a wasteful number, since it uses less digits than its factorization.

6421551246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32432096 (or 32432093 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 6421551246 is about 80134.5820853893. The cubic root of 6421551246 is about 1858.7171990774.

The spelling of 6421551246 in words is "six billion, four hundred twenty-one million, five hundred fifty-one thousand, two hundred forty-six".