172423873649 has 2 divisors, whose sum is σ = 172423873650. Its totient is φ = 172423873648.

The previous prime is 172423873637. The next prime is 172423873669. The reversal of 172423873649 is 946378324271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91850212624 + 80573661025 = 303068^2 + 283855^2 .

It is a cyclic number.

It is not a de Polignac number, because 172423873649 - 2⁸ = 172423873393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172423873594 and 172423873603.

It is not a weakly prime, because it can be changed into another prime (172423873669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86211936824 + 86211936825.

It is an arithmetic number, because the mean of its divisors is an integer number (86211936825).

Almost surely, 2^172423873649 is an apocalyptic number.

It is an amenable number.

172423873649 is a deficient number, since it is larger than the sum of its proper divisors (1).

172423873649 is an equidigital number, since it uses as much as digits as its factorization.

172423873649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 56.

The spelling of 172423873649 in words is "one hundred seventy-two billion, four hundred twenty-three million, eight hundred seventy-three thousand, six hundred forty-nine".