155112220173 has 4 divisors (see below), whose sum is σ = 206816293568. Its totient is φ = 103408146780.

The previous prime is 155112220157. The next prime is 155112220189. The reversal of 155112220173 is 371022211551.

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 an interprime number because it is at equal distance from previous prime (155112220157) and next prime (155112220189).

It is not a de Polignac number, because 155112220173 - 2⁴ = 155112220157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155112220173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155112220103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25852036693 + ... + 25852036698.

It is an arithmetic number, because the mean of its divisors is an integer number (51704073392).

Almost surely, 2^155112220173 is an apocalyptic number.

It is an amenable number.

155112220173 is a deficient number, since it is larger than the sum of its proper divisors (51704073395).

155112220173 is an equidigital number, since it uses as much as digits as its factorization.

155112220173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51704073394.

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 155112220173 in words is "one hundred fifty-five billion, one hundred twelve million, two hundred twenty thousand, one hundred seventy-three".