155193603840 has 864 divisors, whose sum is σ = 630925993152. Its totient is φ = 34799616000.

The previous prime is 155193603713. The next prime is 155193603853. The reversal of 155193603840 is 48306391551.

155193603840 is a `hidden beast` number, since 1 + 5 + 519 + 3 + 60 + 38 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 131408050 + ... + 131409230.

It is an arithmetic number, because the mean of its divisors is an integer number (730238418).

Almost surely, 2^155193603840 is an apocalyptic number.

155193603840 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 155193603840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315462996576).

155193603840 is an abundant number, since it is smaller than the sum of its proper divisors (475732389312).

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

155193603840 is a wasteful number, since it uses less digits than its factorization.

155193603840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 155193603840 in words is "one hundred fifty-five billion, one hundred ninety-three million, six hundred three thousand, eight hundred forty".