161516161001 has 24 divisors (see below), whose sum is σ = 188591689440. Its totient is φ = 137799792000.

The previous prime is 161516160991. The next prime is 161516161003. The reversal of 161516161001 is 100161615161.

It is a happy number.

It is not a de Polignac number, because 161516161001 - 2²² = 161511966697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161516161003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 481775 + ... + 745076.

It is an arithmetic number, because the mean of its divisors is an integer number (7857987060).

Almost surely, 2^161516161001 is an apocalyptic number.

It is an amenable number.

161516161001 is a deficient number, since it is larger than the sum of its proper divisors (27075528439).

161516161001 is a wasteful number, since it uses less digits than its factorization.

161516161001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226937 (or 1226924 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 29.

Adding to 161516161001 its reverse (100161615161), we get a palindrome (261677776162).

The spelling of 161516161001 in words is "one hundred sixty-one billion, five hundred sixteen million, one hundred sixty-one thousand, one".