155000005920 has 240 divisors, whose sum is σ = 547806587328. Its totient is φ = 41273971200.

The previous prime is 155000005903. The next prime is 155000005957. The reversal of 155000005920 is 29500000551.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9413695 + ... + 9430145.

Almost surely, 2^155000005920 is an apocalyptic number.

155000005920 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 155000005920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273903293664).

155000005920 is an abundant number, since it is smaller than the sum of its proper divisors (392806581408).

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

155000005920 is a wasteful number, since it uses less digits than its factorization.

155000005920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17205 (or 17188 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The spelling of 155000005920 in words is "one hundred fifty-five billion, five thousand, nine hundred twenty".