161387978116 has 24 divisors (see below), whose sum is σ = 283463256384. Its totient is φ = 80398614240.

The previous prime is 161387978083. The next prime is 161387978117. The reversal of 161387978116 is 611879783161.

It is a happy number.

161387978116 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161387978117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5450271 + ... + 5479801.

It is an arithmetic number, because the mean of its divisors is an integer number (11810969016).

Almost surely, 2^161387978116 is an apocalyptic number.

It is an amenable number.

161387978116 is a deficient number, since it is larger than the sum of its proper divisors (122075278268).

161387978116 is a wasteful number, since it uses less digits than its factorization.

161387978116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34491 (or 34489 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 58.

The spelling of 161387978116 in words is "one hundred sixty-one billion, three hundred eighty-seven million, nine hundred seventy-eight thousand, one hundred sixteen".