172374623877881 has 2 divisors, whose sum is σ = 172374623877882. Its totient is φ = 172374623877880.

The previous prime is 172374623877871. The next prime is 172374623877941. The reversal of 172374623877881 is 188778326473271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95793590256400 + 76581033621481 = 9787420^2 + 8751059^2 .

It is an emirp because it is prime and its reverse (188778326473271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172374623877881 - 2⁶ = 172374623877817 is a prime.

It is a super-2 number, since 2×172374623877881² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172374623877799 and 172374623877808.

It is not a weakly prime, because it can be changed into another prime (172374623877821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86187311938940 + 86187311938941.

It is an arithmetic number, because the mean of its divisors is an integer number (86187311938941).

Almost surely, 2^{172374623877881} is an apocalyptic number.

It is an amenable number.

172374623877881 is a deficient number, since it is larger than the sum of its proper divisors (1).

172374623877881 is an equidigital number, since it uses as much as digits as its factorization.

172374623877881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1062125568, while the sum is 74.

The spelling of 172374623877881 in words is "one hundred seventy-two trillion, three hundred seventy-four billion, six hundred twenty-three million, eight hundred seventy-seven thousand, eight hundred eighty-one".