172142611649 has 2 divisors, whose sum is σ = 172142611650. Its totient is φ = 172142611648.

The previous prime is 172142611639. The next prime is 172142611651. The reversal of 172142611649 is 946116241271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149774418049 + 22368193600 = 387007^2 + 149560^2 .

It is a cyclic number.

It is not a de Polignac number, because 172142611649 - 2⁴ = 172142611633 is a prime.

Together with 172142611651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172142611639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86071305824 + 86071305825.

It is an arithmetic number, because the mean of its divisors is an integer number (86071305825).

Almost surely, 2^172142611649 is an apocalyptic number.

It is an amenable number.

172142611649 is a deficient number, since it is larger than the sum of its proper divisors (1).

172142611649 is an equidigital number, since it uses as much as digits as its factorization.

172142611649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The spelling of 172142611649 in words is "one hundred seventy-two billion, one hundred forty-two million, six hundred eleven thousand, six hundred forty-nine".