2578125557 has 4 divisors (see below), whose sum is σ = 2946429216. Its totient is φ = 2209821900.

The previous prime is 2578125547. The next prime is 2578125559. The reversal of 2578125557 is 7555218752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2578125557 - 2⁴ = 2578125541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578125559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184151819 + ... + 184151832.

It is an arithmetic number, because the mean of its divisors is an integer number (736607304).

Almost surely, 2^2578125557 is an apocalyptic number.

It is an amenable number.

2578125557 is a deficient number, since it is larger than the sum of its proper divisors (368303659).

2578125557 is an equidigital number, since it uses as much as digits as its factorization.

2578125557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368303658.

The product of its digits is 980000, while the sum is 47.

The square root of 2578125557 is about 50775.2455139313. The cubic root of 2578125557 is about 1371.2017368568.

The spelling of 2578125557 in words is "two billion, five hundred seventy-eight million, one hundred twenty-five thousand, five hundred fifty-seven".