161540016 has 40 divisors (see below), whose sum is σ = 455250624. Its totient is φ = 48951360.

The previous prime is 161539997. The next prime is 161540047. The reversal of 161540016 is 610045161.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152446 + ... + 153501.

Almost surely, 2^161540016 is an apocalyptic number.

161540016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161540016 is an abundant number, since it is smaller than the sum of its proper divisors (293710608).

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

161540016 is a wasteful number, since it uses less digits than its factorization.

161540016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305969 (or 305963 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161540016 is about 12709.8393380876. The cubic root of 161540016 is about 544.6197341756.

Adding to 161540016 its reverse (610045161), we get a palindrome (771585177).

The spelling of 161540016 in words is "one hundred sixty-one million, five hundred forty thousand, sixteen".