2136661057 has 4 divisors (see below), whose sum is σ = 2139933780. Its totient is φ = 2133388336.

The previous prime is 2136661049. The next prime is 2136661063. The reversal of 2136661057 is 7501666312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 373416976 + 1763244081 = 19324^2 + 41991^2 .

It is a cyclic number.

It is not a de Polignac number, because 2136661057 - 2³ = 2136661049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2136661067) 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, 1635382 + ... + 1636687.

It is an arithmetic number, because the mean of its divisors is an integer number (534983445).

Almost surely, 2^2136661057 is an apocalyptic number.

It is an amenable number.

2136661057 is a deficient number, since it is larger than the sum of its proper divisors (3272723).

2136661057 is an equidigital number, since it uses as much as digits as its factorization.

2136661057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272722.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 2136661057 is about 46224.0311634544. The cubic root of 2136661057 is about 1287.9881821328.

The spelling of 2136661057 in words is "two billion, one hundred thirty-six million, six hundred sixty-one thousand, fifty-seven".