2506578621 has 4 divisors (see below), whose sum is σ = 3342104832. Its totient is φ = 1671052412.

The previous prime is 2506578611. The next prime is 2506578647. The reversal of 2506578621 is 1268756052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2506578621 - 2¹⁷ = 2506447549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506578611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417763101 + ... + 417763106.

It is an arithmetic number, because the mean of its divisors is an integer number (835526208).

Almost surely, 2^2506578621 is an apocalyptic number.

It is an amenable number.

2506578621 is a deficient number, since it is larger than the sum of its proper divisors (835526211).

2506578621 is an equidigital number, since it uses as much as digits as its factorization.

2506578621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835526210.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 2506578621 is about 50065.7429885945. The cubic root of 2506578621 is about 1358.3982405792.

The spelling of 2506578621 in words is "two billion, five hundred six million, five hundred seventy-eight thousand, six hundred twenty-one".