2557685002 has 4 divisors (see below), whose sum is σ = 3836527506. Its totient is φ = 1278842500.

The previous prime is 2557684999. The next prime is 2557685047. The reversal of 2557685002 is 2005867552.

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

It can be written as a sum of positive squares in only one way, i.e., 1851666961 + 706018041 = 43031^2 + 26571^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639421249 + ... + 639421252.

Almost surely, 2^2557685002 is an apocalyptic number.

2557685002 is a deficient number, since it is larger than the sum of its proper divisors (1278842504).

2557685002 is a wasteful number, since it uses less digits than its factorization.

2557685002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278842503.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 2557685002 is about 50573.5603057566. The cubic root of 2557685002 is about 1367.5682797640.

The spelling of 2557685002 in words is "two billion, five hundred fifty-seven million, six hundred eighty-five thousand, two".