155985816 has 192 divisors, whose sum is σ = 485913600. Its totient is φ = 41513472.

The previous prime is 155985799. The next prime is 155985827. The reversal of 155985816 is 618589551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1974465 + ... + 1974543.

It is an arithmetic number, because the mean of its divisors is an integer number (2530800).

Almost surely, 2^155985816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155985816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242956800).

155985816 is an abundant number, since it is smaller than the sum of its proper divisors (329927784).

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

155985816 is a wasteful number, since it uses less digits than its factorization.

155985816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 187 counting only the distinct ones).

The product of its digits is 432000, while the sum is 48.

The square root of 155985816 is about 12489.4281694560. The cubic root of 155985816 is about 538.3049454391.

The spelling of 155985816 in words is "one hundred fifty-five million, nine hundred eighty-five thousand, eight hundred sixteen".