155520423 has 12 divisors (see below), whose sum is σ = 225650880. Its totient is φ = 103214016.

The previous prime is 155520373. The next prime is 155520451. The reversal of 155520423 is 324025551.

It is a happy number.

It is not a de Polignac number, because 155520423 - 2¹² = 155516327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155520473) 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 11 ways as a sum of consecutive naturals, for example, 36738 + ... + 40751.

It is an arithmetic number, because the mean of its divisors is an integer number (18804240).

Almost surely, 2^155520423 is an apocalyptic number.

155520423 is a deficient number, since it is larger than the sum of its proper divisors (70130457).

155520423 is a wasteful number, since it uses less digits than its factorization.

155520423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77718 (or 77715 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 155520423 is about 12470.7827741485. The cubic root of 155520423 is about 537.7690571467.

Adding to 155520423 its reverse (324025551), we get a palindrome (479545974).

The spelling of 155520423 in words is "one hundred fifty-five million, five hundred twenty thousand, four hundred twenty-three".