172055443478 has 4 divisors (see below), whose sum is σ = 258083165220. Its totient is φ = 86027721738.

The previous prime is 172055443451. The next prime is 172055443487. The reversal of 172055443478 is 874344550271.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×172055443478² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43013860868 + ... + 43013860871.

It is an arithmetic number, because the mean of its divisors is an integer number (64520791305).

Almost surely, 2^172055443478 is an apocalyptic number.

172055443478 is a deficient number, since it is larger than the sum of its proper divisors (86027721742).

172055443478 is an equidigital number, since it uses as much as digits as its factorization.

172055443478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86027721741.

The product of its (nonzero) digits is 3763200, while the sum is 50.

The spelling of 172055443478 in words is "one hundred seventy-two billion, fifty-five million, four hundred forty-three thousand, four hundred seventy-eight".