155423394489 has 32 divisors (see below), whose sum is σ = 239937586560. Its totient is φ = 88444339200.

The previous prime is 155423394449. The next prime is 155423394509. The reversal of 155423394489 is 984493324551.

It is not a de Polignac number, because 155423394489 - 2¹⁵ = 155423361721 is a prime.

It is a super-2 number, since 2×155423394489² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155423394449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92854 + ... + 565215.

It is an arithmetic number, because the mean of its divisors is an integer number (7498049580).

Almost surely, 2^155423394489 is an apocalyptic number.

It is an amenable number.

155423394489 is a deficient number, since it is larger than the sum of its proper divisors (84514192071).

155423394489 is a wasteful number, since it uses less digits than its factorization.

155423394489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658521.

The product of its digits is 18662400, while the sum is 57.

The spelling of 155423394489 in words is "one hundred fifty-five billion, four hundred twenty-three million, three hundred ninety-four thousand, four hundred eighty-nine".