155511224420 has 24 divisors (see below), whose sum is σ = 326735566584. Its totient is φ = 62173633536.

The previous prime is 155511224419. The next prime is 155511224423. The reversal of 155511224420 is 24422115551.

It can be written as a sum of positive squares in 4 ways, for example, as 80386992676 + 75124231744 = 283526^2 + 274088^2 .

It is not an unprimeable number, because it can be changed into a prime (155511224423) 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, 1887167 + ... + 1967846.

It is an arithmetic number, because the mean of its divisors is an integer number (13613981941).

Almost surely, 2^155511224420 is an apocalyptic number.

155511224420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155511224420 is an abundant number, since it is smaller than the sum of its proper divisors (171224342164).

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

155511224420 is a wasteful number, since it uses less digits than its factorization.

155511224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3857039 (or 3857037 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 155511224420 its reverse (24422115551), we get a palindrome (179933339971).

The spelling of 155511224420 in words is "one hundred fifty-five billion, five hundred eleven million, two hundred twenty-four thousand, four hundred twenty".