6403621402653 has 8 divisors (see below), whose sum is σ = 8634096273600. Its totient is φ = 4221113733408.

The previous prime is 6403621402601. The next prime is 6403621402669. The reversal of 6403621402653 is 3562041263046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6403621402653 - 2¹³ = 6403621394461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403621402253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11991800113 + ... + 11991800646.

It is an arithmetic number, because the mean of its divisors is an integer number (1079262034200).

Almost surely, 2^{6403621402653} is an apocalyptic number.

It is an amenable number.

6403621402653 is a deficient number, since it is larger than the sum of its proper divisors (2230474870947).

6403621402653 is a wasteful number, since it uses less digits than its factorization.

6403621402653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23983600851.

The product of its (nonzero) digits is 622080, while the sum is 42.

Adding to 6403621402653 its reverse (3562041263046), we get a palindrome (9965662665699).

The spelling of 6403621402653 in words is "six trillion, four hundred three billion, six hundred twenty-one million, four hundred two thousand, six hundred fifty-three".