155020055 has 4 divisors (see below), whose sum is σ = 186024072. Its totient is φ = 124016040.

The previous prime is 155020049. The next prime is 155020079. The reversal of 155020055 is 550020551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550020551 = 23 ⋅23913937.

It is not a de Polignac number, because 155020055 - 2⁴ = 155020039 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 155020055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15502001 + ... + 15502010.

It is an arithmetic number, because the mean of its divisors is an integer number (46506018).

Almost surely, 2^155020055 is an apocalyptic number.

155020055 is a deficient number, since it is larger than the sum of its proper divisors (31004017).

155020055 is an equidigital number, since it uses as much as digits as its factorization.

155020055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31004016.

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 155020055 is about 12450.7050001195. The cubic root of 155020055 is about 537.1917020545.

The spelling of 155020055 in words is "one hundred fifty-five million, twenty thousand, fifty-five".