172603813813 has 2 divisors, whose sum is σ = 172603813814. Its totient is φ = 172603813812.

The previous prime is 172603813741. The next prime is 172603813831. The reversal of 172603813813 is 318318306271.

Together with next prime (172603813831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129382651204 + 43221162609 = 359698^2 + 207897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172603813813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172603813813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172603813843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86301906906 + 86301906907.

It is an arithmetic number, because the mean of its divisors is an integer number (86301906907).

Almost surely, 2^172603813813 is an apocalyptic number.

It is an amenable number.

172603813813 is a deficient number, since it is larger than the sum of its proper divisors (1).

172603813813 is an equidigital number, since it uses as much as digits as its factorization.

172603813813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 172603813813 in words is "one hundred seventy-two billion, six hundred three million, eight hundred thirteen thousand, eight hundred thirteen".