155503120120000 has 210 divisors, whose sum is σ = 409613664397652. Its totient is φ = 58542346752000.

The previous prime is 155503120119917. The next prime is 155503120120001. The reversal of 155503120120000 is 21021305551.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (155503120120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4834087 + ... + 18285913.

Almost surely, 2^{155503120120000} is an apocalyptic number.

155503120120000 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 155503120120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204806832198826).

155503120120000 is an abundant number, since it is smaller than the sum of its proper divisors (254110544277652).

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

155503120120000 is an equidigital number, since it uses as much as digits as its factorization.

155503120120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13451893 (or 13451851 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 155503120120000 its reverse (21021305551), we get a palindrome (155524141425551).

The spelling of 155503120120000 in words is "one hundred fifty-five trillion, five hundred three billion, one hundred twenty million, one hundred twenty thousand".