2575421657 has 2 divisors, whose sum is σ = 2575421658. Its totient is φ = 2575421656.

The previous prime is 2575421623. The next prime is 2575421687. The reversal of 2575421657 is 7561245752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1516635136 + 1058786521 = 38944^2 + 32539^2 .

It is a cyclic number.

It is not a de Polignac number, because 2575421657 - 2¹⁰ = 2575420633 is a prime.

It is a super-2 number, since 2×2575421657² = 13265593422689251298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2575421687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1287710828 + 1287710829.

It is an arithmetic number, because the mean of its divisors is an integer number (1287710829).

Almost surely, 2^2575421657 is an apocalyptic number.

It is an amenable number.

2575421657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2575421657 is an equidigital number, since it uses as much as digits as its factorization.

2575421657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 588000, while the sum is 44.

The square root of 2575421657 is about 50748.6123652657. The cubic root of 2575421657 is about 1370.7222038000.

The spelling of 2575421657 in words is "two billion, five hundred seventy-five million, four hundred twenty-one thousand, six hundred fifty-seven".