161406738240 has 448 divisors, whose sum is σ = 573324410880. Its totient is φ = 38137282560.

The previous prime is 161406738191. The next prime is 161406738281. The reversal of 161406738240 is 42837604161.

It is a junction number, because it is equal to n+sod(n) for n = 161406738192 and 161406738201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 155347641 + ... + 155348679.

Almost surely, 2^161406738240 is an apocalyptic number.

161406738240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161406738240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286662205440).

161406738240 is an abundant number, since it is smaller than the sum of its proper divisors (411917672640).

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

161406738240 is a wasteful number, since it uses less digits than its factorization.

161406738240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430 (or 1420 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 161406738240 in words is "one hundred sixty-one billion, four hundred six million, seven hundred thirty-eight thousand, two hundred forty".