2005275857 has 4 divisors (see below), whose sum is σ = 2159527860. Its totient is φ = 1851023856.

The previous prime is 2005275841. The next prime is 2005275869. The reversal of 2005275857 is 7585725002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7585725002 = 2 ⋅3792862501.

It can be written as a sum of positive squares in 2 ways, for example, as 224520256 + 1780755601 = 14984^2 + 42199^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005275857 - 2⁴ = 2005275841 is a prime.

It is a super-2 number, since 2×2005275857² = 8042262525334168898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2005275887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77125982 + ... + 77126007.

It is an arithmetic number, because the mean of its divisors is an integer number (539881965).

Almost surely, 2^2005275857 is an apocalyptic number.

It is an amenable number.

2005275857 is a deficient number, since it is larger than the sum of its proper divisors (154252003).

2005275857 is a wasteful number, since it uses less digits than its factorization.

2005275857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154252002.

The product of its (nonzero) digits is 196000, while the sum is 41.

The square root of 2005275857 is about 44780.3065755472. The cubic root of 2005275857 is about 1261.0279377161.

The spelling of 2005275857 in words is "two billion, five million, two hundred seventy-five thousand, eight hundred fifty-seven".