2570505661 has 4 divisors (see below), whose sum is σ = 2571316924. Its totient is φ = 2569694400.

The previous prime is 2570505659. The next prime is 2570505677. The reversal of 2570505661 is 1665050752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1400181561 + 1170324100 = 37419^2 + 34210^2 .

It is a cyclic number.

It is not a de Polignac number, because 2570505661 - 2¹ = 2570505659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2570505661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2570505061) 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, 400860 + ... + 407221.

It is an arithmetic number, because the mean of its divisors is an integer number (642829231).

Almost surely, 2^2570505661 is an apocalyptic number.

It is an amenable number.

2570505661 is a deficient number, since it is larger than the sum of its proper divisors (811263).

2570505661 is an equidigital number, since it uses as much as digits as its factorization.

2570505661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811262.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 2570505661 is about 50700.1544474965. The cubic root of 2570505661 is about 1369.8494979147.

The spelling of 2570505661 in words is "two billion, five hundred seventy million, five hundred five thousand, six hundred sixty-one".