2081661157 has 2 divisors, whose sum is σ = 2081661158. Its totient is φ = 2081661156.

The previous prime is 2081661103. The next prime is 2081661167. The reversal of 2081661157 is 7511661802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1889727841 + 191933316 = 43471^2 + 13854^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081661157 - 2²³ = 2073272549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081661167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040830578 + 1040830579.

It is an arithmetic number, because the mean of its divisors is an integer number (1040830579).

Almost surely, 2^2081661157 is an apocalyptic number.

It is an amenable number.

2081661157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081661157 is an equidigital number, since it uses as much as digits as its factorization.

2081661157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 2081661157 is about 45625.2250076643. The cubic root of 2081661157 is about 1276.8405879926.

The spelling of 2081661157 in words is "two billion, eighty-one million, six hundred sixty-one thousand, one hundred fifty-seven".