161016501 has 16 divisors (see below), whose sum is σ = 221405184. Its totient is φ = 104031024.

The previous prime is 161016473. The next prime is 161016509. The reversal of 161016501 is 105610161.

It is not a de Polignac number, because 161016501 - 2⁹ = 161015989 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161016509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8980 + ... + 20066.

It is an arithmetic number, because the mean of its divisors is an integer number (13837824).

Almost surely, 2^161016501 is an apocalyptic number.

It is an amenable number.

161016501 is a deficient number, since it is larger than the sum of its proper divisors (60388683).

161016501 is a wasteful number, since it uses less digits than its factorization.

161016501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11240.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 161016501 is about 12689.2277542804. The cubic root of 161016501 is about 544.0307673000.

Adding to 161016501 its reverse (105610161), we get a palindrome (266626662).

The spelling of 161016501 in words is "one hundred sixty-one million, sixteen thousand, five hundred one".