155998206040 has 64 divisors (see below), whose sum is σ = 357083082720. Its totient is φ = 61319040000.

The previous prime is 155998205999. The next prime is 155998206041. The reversal of 155998206040 is 40602899551.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155998206041) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2632740 + ... + 2691340.

Almost surely, 2^155998206040 is an apocalyptic number.

155998206040 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 155998206040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178541541360).

155998206040 is an abundant number, since it is smaller than the sum of its proper divisors (201084876680).

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

155998206040 is a wasteful number, since it uses less digits than its factorization.

155998206040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59764 (or 59760 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 155998206040 in words is "one hundred fifty-five billion, nine hundred ninety-eight million, two hundred six thousand, forty".