161650100501 has 4 divisors (see below), whose sum is σ = 166864619904. Its totient is φ = 156435581100.

The previous prime is 161650100483. The next prime is 161650100533. The reversal of 161650100501 is 105001056161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161650100501 is a prime.

It is a super-2 number, since 2×161650100501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161650100581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2607259655 + ... + 2607259716.

It is an arithmetic number, because the mean of its divisors is an integer number (41716154976).

Almost surely, 2^161650100501 is an apocalyptic number.

It is an amenable number.

161650100501 is a deficient number, since it is larger than the sum of its proper divisors (5214519403).

161650100501 is an equidigital number, since it uses as much as digits as its factorization.

161650100501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5214519402.

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 161650100501 its reverse (105001056161), we get a palindrome (266651156662).

The spelling of 161650100501 in words is "one hundred sixty-one billion, six hundred fifty million, one hundred thousand, five hundred one".