16610506121 has 4 divisors (see below), whose sum is σ = 18120552144. Its totient is φ = 15100460100.

The previous prime is 16610506111. The next prime is 16610506169. The reversal of 16610506121 is 12160501661.

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 not a de Polignac number, because 16610506121 - 2¹⁰ = 16610505097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16610506111) 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, 755022995 + ... + 755023016.

It is an arithmetic number, because the mean of its divisors is an integer number (4530138036).

Almost surely, 2^16610506121 is an apocalyptic number.

16610506121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16610506121 is a deficient number, since it is larger than the sum of its proper divisors (1510046023).

16610506121 is a wasteful number, since it uses less digits than its factorization.

16610506121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510046022.

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 16610506121 in words is "sixteen billion, six hundred ten million, five hundred six thousand, one hundred twenty-one".