161011878456 has 512 divisors, whose sum is σ = 519202897920. Its totient is φ = 40853299200.

The previous prime is 161011878449. The next prime is 161011878497. The reversal of 161011878456 is 654878110161.

161011878456 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 194693515 + ... + 194694341.

It is an arithmetic number, because the mean of its divisors is an integer number (1014068160).

Almost surely, 2^161011878456 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 161011878456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259601448960).

161011878456 is an abundant number, since it is smaller than the sum of its proper divisors (358191019464).

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

161011878456 is a wasteful number, since it uses less digits than its factorization.

161011878456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 161011878456 in words is "one hundred sixty-one billion, eleven million, eight hundred seventy-eight thousand, four hundred fifty-six".