155601222000 has 320 divisors, whose sum is σ = 603501849600. Its totient is φ = 33693926400.

The previous prime is 155601221999. The next prime is 155601222011. The reversal of 155601222000 is 222106551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 700506 + ... + 895494.

It is an arithmetic number, because the mean of its divisors is an integer number (1885943280).

Almost surely, 2^155601222000 is an apocalyptic number.

155601222000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155601222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301750924800).

155601222000 is an abundant number, since it is smaller than the sum of its proper divisors (447900627600).

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

155601222000 is a wasteful number, since it uses less digits than its factorization.

155601222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195041 (or 195025 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 155601222000 its reverse (222106551), we get a palindrome (155823328551).

The spelling of 155601222000 in words is "one hundred fifty-five billion, six hundred one million, two hundred twenty-two thousand".