155161603 has 4 divisors (see below), whose sum is σ = 160166848. Its totient is φ = 150156360.

The previous prime is 155161583. The next prime is 155161607. The reversal of 155161603 is 306161551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 306161551 = 17 ⋅18009503.

It is a cyclic number.

It is not a de Polignac number, because 155161603 - 2²¹ = 153064451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155161607) 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, 2502576 + ... + 2502637.

It is an arithmetic number, because the mean of its divisors is an integer number (40041712).

Almost surely, 2^155161603 is an apocalyptic number.

155161603 is a deficient number, since it is larger than the sum of its proper divisors (5005245).

155161603 is an equidigital number, since it uses as much as digits as its factorization.

155161603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5005244.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 155161603 is about 12456.3880398774. The cubic root of 155161603 is about 537.3551546248.

The spelling of 155161603 in words is "one hundred fifty-five million, one hundred sixty-one thousand, six hundred three".