181159436940 has 24 divisors (see below), whose sum is σ = 507246423600. Its totient is φ = 48309183168.

The previous prime is 181159436921. The next prime is 181159436951. The reversal of 181159436940 is 49634951181.

It is a happy 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, 1509661915 + ... + 1509662034.

It is an arithmetic number, because the mean of its divisors is an integer number (21135267650).

Almost surely, 2^181159436940 is an apocalyptic number.

181159436940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181159436940 is an abundant number, since it is smaller than the sum of its proper divisors (326086986660).

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

181159436940 is a wasteful number, since it uses less digits than its factorization.

181159436940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019323961 (or 3019323959 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 181159436940 in words is "one hundred eighty-one billion, one hundred fifty-nine million, four hundred thirty-six thousand, nine hundred forty".