2157665233 has 2 divisors, whose sum is σ = 2157665234. Its totient is φ = 2157665232.

The previous prime is 2157665231. The next prime is 2157665273. The reversal of 2157665233 is 3325667512.

It is an a-pointer prime, because the next prime (2157665273) can be obtained adding 2157665233 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1481249169 + 676416064 = 38487^2 + 26008^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157665233 - 2¹ = 2157665231 is a prime.

Together with 2157665231, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2157665231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078832616 + 1078832617.

It is an arithmetic number, because the mean of its divisors is an integer number (1078832617).

Almost surely, 2^2157665233 is an apocalyptic number.

It is an amenable number.

2157665233 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157665233 is an equidigital number, since it uses as much as digits as its factorization.

2157665233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

The square root of 2157665233 is about 46450.6752695803. The cubic root of 2157665233 is about 1292.1948958274.

The spelling of 2157665233 in words is "two billion, one hundred fifty-seven million, six hundred sixty-five thousand, two hundred thirty-three".