155105280000 has 1500 divisors, whose sum is σ = 668847081672. Its totient is φ = 35389440000.

The previous prime is 155105279981. The next prime is 155105280007. The reversal of 155105280000 is 82501551.

It is a tau number, because it is divible by the number of its divisors (1500).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (155105280007) by changing a digit.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 9123839992 + ... + 9123840008.

Almost surely, 2^155105280000 is an apocalyptic number.

155105280000 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 155105280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334423540836).

155105280000 is an abundant number, since it is smaller than the sum of its proper divisors (513741801672).

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

155105280000 is an frugal number, since it uses more digits than its factorization.

155105280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 155105280000 its reverse (82501551), we get a palindrome (155187781551).

The spelling of 155105280000 in words is "one hundred fifty-five billion, one hundred five million, two hundred eighty thousand".