2581720511 has 2 divisors, whose sum is σ = 2581720512. Its totient is φ = 2581720510.

The previous prime is 2581720457. The next prime is 2581720597. The reversal of 2581720511 is 1150271852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2581720511 - 2¹⁸ = 2581458367 is a prime.

It is a super-2 number, since 2×2581720511² = 13330561593836202242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2581720111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290860255 + 1290860256.

It is an arithmetic number, because the mean of its divisors is an integer number (1290860256).

Almost surely, 2^2581720511 is an apocalyptic number.

2581720511 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581720511 is an equidigital number, since it uses as much as digits as its factorization.

2581720511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 32.

The square root of 2581720511 is about 50810.6338378100. The cubic root of 2581720511 is about 1371.8387782052.

The spelling of 2581720511 in words is "two billion, five hundred eighty-one million, seven hundred twenty thousand, five hundred eleven".