172374474781 has 4 divisors (see below), whose sum is σ = 172391587200. Its totient is φ = 172357362364.

The previous prime is 172374474757. The next prime is 172374474791. The reversal of 172374474781 is 187474473271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172374474781 - 2⁵ = 172374474749 is a prime.

It is a super-2 number, since 2×172374474781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172374474791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8541091 + ... + 8561248.

It is an arithmetic number, because the mean of its divisors is an integer number (43097896800).

Almost surely, 2^172374474781 is an apocalyptic number.

It is an amenable number.

172374474781 is a deficient number, since it is larger than the sum of its proper divisors (17112419).

172374474781 is a wasteful number, since it uses less digits than its factorization.

172374474781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17112418.

The product of its digits is 7375872, while the sum is 55.

The spelling of 172374474781 in words is "one hundred seventy-two billion, three hundred seventy-four million, four hundred seventy-four thousand, seven hundred eighty-one".