181081614840 has 96 divisors (see below), whose sum is σ = 631937900880. Its totient is φ = 41390082048.

The previous prime is 181081614839. The next prime is 181081614841. The reversal of 181081614840 is 48416180181.

It is an interprime number because it is at equal distance from previous prime (181081614839) and next prime (181081614841).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 181081614792 and 181081614801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181081614841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15392217 + ... + 15403976.

Almost surely, 2^181081614840 is an apocalyptic number.

181081614840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181081614840 is an abundant number, since it is smaller than the sum of its proper divisors (450856286040).

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

181081614840 is a wasteful number, since it uses less digits than its factorization.

181081614840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30796221 (or 30796210 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 42.

The spelling of 181081614840 in words is "one hundred eighty-one billion, eighty-one million, six hundred fourteen thousand, eight hundred forty".