2556621013 has 8 divisors (see below), whose sum is σ = 2577096000. Its totient is φ = 2536220928.

The previous prime is 2556620999. The next prime is 2556621043. The reversal of 2556621013 is 3101266552.

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

It is a cyclic number.

It is not a de Polignac number, because 2556621013 - 2²¹ = 2554523861 is a prime.

It is a super-2 number, since 2×2556621013² = 13072622008226292338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556621043) 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, 50838 + ... + 87736.

It is an arithmetic number, because the mean of its divisors is an integer number (322137000).

Almost surely, 2^2556621013 is an apocalyptic number.

It is an amenable number.

2556621013 is a deficient number, since it is larger than the sum of its proper divisors (20474987).

2556621013 is a wasteful number, since it uses less digits than its factorization.

2556621013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37451.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2556621013 is about 50563.0399897000. The cubic root of 2556621013 is about 1367.3786187462.

Adding to 2556621013 its reverse (3101266552), we get a palindrome (5657887565).

The spelling of 2556621013 in words is "two billion, five hundred fifty-six million, six hundred twenty-one thousand, thirteen".