155055220 has 12 divisors (see below), whose sum is σ = 325616004. Its totient is φ = 62022080.

The previous prime is 155055193. The next prime is 155055221. The reversal of 155055220 is 22550551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55175184 + 99880036 = 7428^2 + 9994^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155055221) 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, 3876361 + ... + 3876400.

It is an arithmetic number, because the mean of its divisors is an integer number (27134667).

Almost surely, 2^155055220 is an apocalyptic number.

155055220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155055220 is an abundant number, since it is smaller than the sum of its proper divisors (170560784).

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

155055220 is a wasteful number, since it uses less digits than its factorization.

155055220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7752770 (or 7752768 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 155055220 is about 12452.1170890736. The cubic root of 155055220 is about 537.2323181283.

The spelling of 155055220 in words is "one hundred fifty-five million, fifty-five thousand, two hundred twenty".