16212058661 has 4 divisors (see below), whose sum is σ = 16212369324. Its totient is φ = 16211748000.

The previous prime is 16212058651. The next prime is 16212058711. The reversal of 16212058661 is 16685021261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 299497636 + 15912561025 = 17306^2 + 126145^2 .

It is a cyclic number.

It is not a de Polignac number, because 16212058661 - 2¹⁰ = 16212057637 is a prime.

It is a super-2 number, since 2×16212058661² (a number of 21 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 (16212058651) 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, 55790 + ... + 188511.

It is an arithmetic number, because the mean of its divisors is an integer number (4053092331).

Almost surely, 2^16212058661 is an apocalyptic number.

It is an amenable number.

16212058661 is a deficient number, since it is larger than the sum of its proper divisors (310663).

16212058661 is an equidigital number, since it uses as much as digits as its factorization.

16212058661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310662.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 16212058661 in words is "sixteen billion, two hundred twelve million, fifty-eight thousand, six hundred sixty-one".