155613320 has 16 divisors (see below), whose sum is σ = 350130060. Its totient is φ = 62245312.

The previous prime is 155613301. The next prime is 155613323. The reversal of 155613320 is 23316551.

It can be written as a sum of positive squares in 2 ways, for example, as 154206724 + 1406596 = 12418^2 + 1186^2 .

It is a super-2 number, since 2×155613320² = 48431010722844800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155613320.

It is not an unprimeable number, because it can be changed into a prime (155613323) 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, 1945127 + ... + 1945206.

Almost surely, 2^155613320 is an apocalyptic number.

155613320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155613320 is an abundant number, since it is smaller than the sum of its proper divisors (194516740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155613320 is a wasteful number, since it uses less digits than its factorization.

155613320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890344 (or 3890340 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 155613320 is about 12474.5068038781. The cubic root of 155613320 is about 537.8761110145.

Adding to 155613320 its reverse (23316551), we get a palindrome (178929871).

It can be divided in two parts, 15561 and 3320, that added together give a palindrome (18881).

The spelling of 155613320 in words is "one hundred fifty-five million, six hundred thirteen thousand, three hundred twenty".