155223043420 has 24 divisors (see below), whose sum is σ = 345143003184. Its totient is φ = 58436910336.

The previous prime is 155223043399. The next prime is 155223043463. The reversal of 155223043420 is 24340322551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228268842 + ... + 228269521.

It is an arithmetic number, because the mean of its divisors is an integer number (14380958466).

Almost surely, 2^155223043420 is an apocalyptic number.

155223043420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155223043420 is an abundant number, since it is smaller than the sum of its proper divisors (189919959764).

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

155223043420 is a wasteful number, since it uses less digits than its factorization.

155223043420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456538389 (or 456538387 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 155223043420 its reverse (24340322551), we get a palindrome (179563365971).

The spelling of 155223043420 in words is "one hundred fifty-five billion, two hundred twenty-three million, forty-three thousand, four hundred twenty".