2557406309 has 8 divisors (see below), whose sum is σ = 2568504480. Its totient is φ = 2546330256.

The previous prime is 2557406227. The next prime is 2557406311. The reversal of 2557406309 is 9036047552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2557406309 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 (2557406809) 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 7 ways as a sum of consecutive naturals, for example, 251447 + ... + 261419.

It is an arithmetic number, because the mean of its divisors is an integer number (321063060).

Almost surely, 2^2557406309 is an apocalyptic number.

It is an amenable number.

2557406309 is a deficient number, since it is larger than the sum of its proper divisors (11098171).

2557406309 is an equidigital number, since it uses as much as digits as its factorization.

2557406309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11059.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 2557406309 is about 50570.8049075749. The cubic root of 2557406309 is about 1367.5186065178.

The spelling of 2557406309 in words is "two billion, five hundred fifty-seven million, four hundred six thousand, three hundred nine".