2172655157 has 2 divisors, whose sum is σ = 2172655158. Its totient is φ = 2172655156.

The previous prime is 2172655099. The next prime is 2172655159. The reversal of 2172655157 is 7515562712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2127146641 + 45508516 = 46121^2 + 6746^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172655157 - 2⁸ = 2172654901 is a prime.

Together with 2172655159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172655159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086327578 + 1086327579.

It is an arithmetic number, because the mean of its divisors is an integer number (1086327579).

Almost surely, 2^2172655157 is an apocalyptic number.

It is an amenable number.

2172655157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172655157 is an equidigital number, since it uses as much as digits as its factorization.

2172655157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 41.

The square root of 2172655157 is about 46611.7491304499. The cubic root of 2172655157 is about 1295.1804098620.

The spelling of 2172655157 in words is "two billion, one hundred seventy-two million, six hundred fifty-five thousand, one hundred fifty-seven".