2151205705 has 16 divisors (see below), whose sum is σ = 2819927808. Its totient is φ = 1562400000.

The previous prime is 2151205697. The next prime is 2151205717. The reversal of 2151205705 is 5075021512.

It is not a de Polignac number, because 2151205705 - 2³ = 2151205697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15265 + ... + 67345.

It is an arithmetic number, because the mean of its divisors is an integer number (176245488).

Almost surely, 2^2151205705 is an apocalyptic number.

It is an amenable number.

2151205705 is a deficient number, since it is larger than the sum of its proper divisors (668722103).

2151205705 is a wasteful number, since it uses less digits than its factorization.

2151205705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52848.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 2151205705 is about 46381.0921065902. The cubic root of 2151205705 is about 1290.9041005011.

The spelling of 2151205705 in words is "two billion, one hundred fifty-one million, two hundred five thousand, seven hundred five".