155216323872 has 192 divisors, whose sum is σ = 468064396800. Its totient is φ = 50636876544.

The previous prime is 155216323831. The next prime is 155216323891. The reversal of 155216323872 is 278323612551.

155216323872 is a `hidden beast` number, since 1 + 5 + 5 + 2 + 1 + 632 + 3 + 8 + 7 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3265654 + ... + 3312842.

It is an arithmetic number, because the mean of its divisors is an integer number (2437835400).

Almost surely, 2^155216323872 is an apocalyptic number.

155216323872 is a gapful number since it is divisible by the number (12) 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 155216323872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234032198400).

155216323872 is an abundant number, since it is smaller than the sum of its proper divisors (312848072928).

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

155216323872 is an frugal number, since it uses more digits than its factorization.

155216323872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47267 (or 47241 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 155216323872 in words is "one hundred fifty-five billion, two hundred sixteen million, three hundred twenty-three thousand, eight hundred seventy-two".