6423217721455 has 16 divisors (see below), whose sum is σ = 7786518729408. Its totient is φ = 5086378080000.

The previous prime is 6423217721449. The next prime is 6423217721513. The reversal of 6423217721455 is 5541277123246.

It is a happy number.

It is not a de Polignac number, because 6423217721455 - 2³ = 6423217721447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6423217721399 and 6423217721408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14925876 + ... + 15350185.

It is an arithmetic number, because the mean of its divisors is an integer number (486657420588).

Almost surely, 2^{6423217721455} is an apocalyptic number.

6423217721455 is a deficient number, since it is larger than the sum of its proper divisors (1363301007953).

6423217721455 is a wasteful number, since it uses less digits than its factorization.

6423217721455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30276498.

The product of its digits is 2822400, while the sum is 49.

The spelling of 6423217721455 in words is "six trillion, four hundred twenty-three billion, two hundred seventeen million, seven hundred twenty-one thousand, four hundred fifty-five".