155550445 has 4 divisors (see below), whose sum is σ = 186660540. Its totient is φ = 124440352.

The previous prime is 155550413. The next prime is 155550457. The reversal of 155550445 is 544055551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50098084 + 105452361 = 7078^2 + 10269^2 .

It is a cyclic number.

It is not a de Polignac number, because 155550445 - 2⁵ = 155550413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155550445.

It is a congruent number.

It is an unprimeable number.

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, 15555040 + ... + 15555049.

It is an arithmetic number, because the mean of its divisors is an integer number (46665135).

Almost surely, 2^155550445 is an apocalyptic number.

It is an amenable number.

155550445 is a deficient number, since it is larger than the sum of its proper divisors (31110095).

155550445 is an equidigital number, since it uses as much as digits as its factorization.

155550445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31110094.

The product of its (nonzero) digits is 50000, while the sum is 34.

The square root of 155550445 is about 12471.9864095500. The cubic root of 155550445 is about 537.8036589555.

The spelling of 155550445 in words is "one hundred fifty-five million, five hundred fifty thousand, four hundred forty-five".