2506613621 has 2 divisors, whose sum is σ = 2506613622. Its totient is φ = 2506613620.

The previous prime is 2506613611. The next prime is 2506613633. The reversal of 2506613621 is 1263166052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2493004900 + 13608721 = 49930^2 + 3689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2506613621 is a prime.

It is a super-2 number, since 2×2506613621² = 12566223689965463282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2506613611) 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 as a sum of consecutive naturals, namely, 1253306810 + 1253306811.

It is an arithmetic number, because the mean of its divisors is an integer number (1253306811).

Almost surely, 2^2506613621 is an apocalyptic number.

It is an amenable number.

2506613621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2506613621 is an equidigital number, since it uses as much as digits as its factorization.

2506613621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2506613621 is about 50066.0925277777. The cubic root of 2506613621 is about 1358.4045631041.

Adding to 2506613621 its reverse (1263166052), we get a palindrome (3769779673).

The spelling of 2506613621 in words is "two billion, five hundred six million, six hundred thirteen thousand, six hundred twenty-one".