155040073 has 4 divisors (see below), whose sum is σ = 157223808. Its totient is φ = 152856340.

The previous prime is 155040059. The next prime is 155040091. The reversal of 155040073 is 370040551.

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 a cyclic number.

It is not a de Polignac number, because 155040073 - 2²⁵ = 121485641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155040043) 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, 1091761 + ... + 1091902.

It is an arithmetic number, because the mean of its divisors is an integer number (39305952).

Almost surely, 2^155040073 is an apocalyptic number.

It is an amenable number.

155040073 is a deficient number, since it is larger than the sum of its proper divisors (2183735).

155040073 is an equidigital number, since it uses as much as digits as its factorization.

155040073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183734.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 155040073 is about 12451.5088643907. The cubic root of 155040073 is about 537.2148238814.

The spelling of 155040073 in words is "one hundred fifty-five million, forty thousand, seventy-three".