172426873649 has 2 divisors, whose sum is σ = 172426873650. Its totient is φ = 172426873648.

The previous prime is 172426873631. The next prime is 172426873657. The reversal of 172426873649 is 946378624271.

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., 108926401600 + 63500472049 = 330040^2 + 251993^2 .

It is an emirp because it is prime and its reverse (946378624271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172426873649 is a prime.

It is not a weakly prime, because it can be changed into another prime (172423873649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86213436824 + 86213436825.

It is an arithmetic number, because the mean of its divisors is an integer number (86213436825).

Almost surely, 2^172426873649 is an apocalyptic number.

It is an amenable number.

172426873649 is a deficient number, since it is larger than the sum of its proper divisors (1).

172426873649 is an equidigital number, since it uses as much as digits as its factorization.

172426873649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24385536, while the sum is 59.

The spelling of 172426873649 in words is "one hundred seventy-two billion, four hundred twenty-six million, eight hundred seventy-three thousand, six hundred forty-nine".