2521623643 has 12 divisors (see below), whose sum is σ = 3199983192. Its totient is φ = 1964901120.

The previous prime is 2521623641. The next prime is 2521623661. The reversal of 2521623643 is 3463261252.

It is not a de Polignac number, because 2521623643 - 2¹ = 2521623641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2521623599 and 2521623608.

It is not an unprimeable number, because it can be changed into a prime (2521623641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2338630 + ... + 2339707.

It is an arithmetic number, because the mean of its divisors is an integer number (266665266).

Almost surely, 2^2521623643 is an apocalyptic number.

2521623643 is a deficient number, since it is larger than the sum of its proper divisors (678359549).

2521623643 is a wasteful number, since it uses less digits than its factorization.

2521623643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4678362 (or 4678355 counting only the distinct ones).

The product of its digits is 51840, while the sum is 34.

The square root of 2521623643 is about 50215.7708593625. The cubic root of 2521623643 is about 1361.1106201419.

Adding to 2521623643 its reverse (3463261252), we get a palindrome (5984884895).

The spelling of 2521623643 in words is "two billion, five hundred twenty-one million, six hundred twenty-three thousand, six hundred forty-three".