181218071552 has 88 divisors (see below), whose sum is σ = 414237470400. Its totient is φ = 77622312960.

The previous prime is 181218071549. The next prime is 181218071563. The reversal of 181218071552 is 255170812181.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15484199 + ... + 15495897.

Almost surely, 2^181218071552 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 181218071552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207118735200).

181218071552 is an abundant number, since it is smaller than the sum of its proper divisors (233019398848).

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

181218071552 is a wasteful number, since it uses less digits than its factorization.

181218071552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13887 (or 13869 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 41.

The spelling of 181218071552 in words is "one hundred eighty-one billion, two hundred eighteen million, seventy-one thousand, five hundred fifty-two".