155880073 has 4 divisors (see below), whose sum is σ = 159682068. Its totient is φ = 152078080.

The previous prime is 155880041. The next prime is 155880077. The reversal of 155880073 is 370088551.

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 13483584 + 142396489 = 3672^2 + 11933^2 .

It is a cyclic number.

It is not a de Polignac number, because 155880073 - 2⁵ = 155880041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155880077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1900936 + ... + 1901017.

It is an arithmetic number, because the mean of its divisors is an integer number (39920517).

Almost surely, 2^155880073 is an apocalyptic number.

It is an amenable number.

155880073 is a deficient number, since it is larger than the sum of its proper divisors (3801995).

155880073 is an equidigital number, since it uses as much as digits as its factorization.

155880073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801994.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 155880073 is about 12485.1941514740. The cubic root of 155880073 is about 538.1832787204.

The spelling of 155880073 in words is "one hundred fifty-five million, eight hundred eighty thousand, seventy-three".