2506720557 has 16 divisors (see below), whose sum is σ = 3647562048. Its totient is φ = 1518631680.

The previous prime is 2506720553. The next prime is 2506720571. The reversal of 2506720557 is 7550276052.

It is not a de Polignac number, because 2506720557 - 2² = 2506720553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506720553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80083 + ... + 106895.

It is an arithmetic number, because the mean of its divisors is an integer number (227972628).

Almost surely, 2^2506720557 is an apocalyptic number.

It is an amenable number.

2506720557 is a deficient number, since it is larger than the sum of its proper divisors (1140841491).

2506720557 is a wasteful number, since it uses less digits than its factorization.

2506720557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29660.

The product of its (nonzero) digits is 147000, while the sum is 39.

The square root of 2506720557 is about 50067.1604647198. The cubic root of 2506720557 is about 1358.4238800401.

The spelling of 2506720557 in words is "two billion, five hundred six million, seven hundred twenty thousand, five hundred fifty-seven".