161215201501 has 16 divisors (see below), whose sum is σ = 174610695168. Its totient is φ = 148406860800.

The previous prime is 161215201489. The next prime is 161215201513. The reversal of 161215201501 is 105102512161.

It is an interprime number because it is at equal distance from previous prime (161215201489) and next prime (161215201513).

It is a cyclic number.

It is not a de Polignac number, because 161215201501 - 2¹⁹ = 161214677213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161215201531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495556 + ... + 753661.

It is an arithmetic number, because the mean of its divisors is an integer number (10913168448).

Almost surely, 2^161215201501 is an apocalyptic number.

It is an amenable number.

161215201501 is a deficient number, since it is larger than the sum of its proper divisors (13395493667).

161215201501 is a wasteful number, since it uses less digits than its factorization.

161215201501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249452.

The product of its (nonzero) digits is 600, while the sum is 25.

Adding to 161215201501 its reverse (105102512161), we get a palindrome (266317713662).

The spelling of 161215201501 in words is "one hundred sixty-one billion, two hundred fifteen million, two hundred one thousand, five hundred one".