2557158781 has 8 divisors (see below), whose sum is σ = 2646720000. Its totient is φ = 2467689840.

The previous prime is 2557158767. The next prime is 2557158803. The reversal of 2557158781 is 1878517552.

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-2557158781 is a prime.

It is a super-2 number, since 2×2557158781² = 13078122062490811922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557158761) 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, 35916 + ... + 80026.

It is an arithmetic number, because the mean of its divisors is an integer number (330840000).

Almost surely, 2^2557158781 is an apocalyptic number.

It is an amenable number.

2557158781 is a deficient number, since it is larger than the sum of its proper divisors (89561219).

2557158781 is a wasteful number, since it uses less digits than its factorization.

2557158781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46139.

The product of its digits is 784000, while the sum is 49.

The square root of 2557158781 is about 50568.3575074374. The cubic root of 2557158781 is about 1367.4744849839.

The spelling of 2557158781 in words is "two billion, five hundred fifty-seven million, one hundred fifty-eight thousand, seven hundred eighty-one".