155544354220 has 24 divisors (see below), whose sum is σ = 326663795808. Its totient is φ = 62213808000.

The previous prime is 155544354167. The next prime is 155544354227. The reversal of 155544354220 is 22453445551.

It is a super-2 number, since 2×155544354220² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155544354227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89545 + ... + 564895.

It is an arithmetic number, because the mean of its divisors is an integer number (13610991492).

Almost surely, 2^155544354220 is an apocalyptic number.

155544354220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155544354220 is an abundant number, since it is smaller than the sum of its proper divisors (171119441588).

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

155544354220 is a wasteful number, since it uses less digits than its factorization.

155544354220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491721 (or 491719 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 40.

Adding to 155544354220 its reverse (22453445551), we get a palindrome (177997799771).

The spelling of 155544354220 in words is "one hundred fifty-five billion, five hundred forty-four million, three hundred fifty-four thousand, two hundred twenty".