6421594711455 has 672 divisors, whose sum is σ = 15542853480000. Its totient is φ = 2512929484800.

The previous prime is 6421594711453. The next prime is 6421594711471. The reversal of 6421594711455 is 5541174951246.

6421594711455 is a `hidden beast` number, since 6 + 4 + 2 + 1 + 594 + 7 + 1 + 1 + 45 + 5 = 666.

It is not a de Polignac number, because 6421594711455 - 2¹ = 6421594711453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421594711453) by changing a digit.

It is a polite number, since it can be written in 671 ways as a sum of consecutive naturals, for example, 2335973421 + ... + 2335976169.

It is an arithmetic number, because the mean of its divisors is an integer number (23129246250).

Almost surely, 2^{6421594711455} is an apocalyptic number.

6421594711455 is an abundant number, since it is smaller than the sum of its proper divisors (9121258768545).

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

6421594711455 is a wasteful number, since it uses less digits than its factorization.

6421594711455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867 (or 2845 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 54.

The spelling of 6421594711455 in words is "six trillion, four hundred twenty-one billion, five hundred ninety-four million, seven hundred eleven thousand, four hundred fifty-five".