16232101661 has 4 divisors (see below), whose sum is σ = 16454459292. Its totient is φ = 16009744032.

The previous prime is 16232101651. The next prime is 16232101703. The reversal of 16232101661 is 16610123261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16610123261 = 83 ⋅200121967.

It can be written as a sum of positive squares in 2 ways, for example, as 7110705625 + 9121396036 = 84325^2 + 95506^2 .

It is a cyclic number.

It is not a de Polignac number, because 16232101661 - 2¹⁰ = 16232100637 is a prime.

It is a super-2 number, since 2×16232101661² (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 (16232101601) 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, 111178706 + ... + 111178851.

It is an arithmetic number, because the mean of its divisors is an integer number (4113614823).

Almost surely, 2^16232101661 is an apocalyptic number.

It is an amenable number.

16232101661 is a deficient number, since it is larger than the sum of its proper divisors (222357631).

16232101661 is an equidigital number, since it uses as much as digits as its factorization.

16232101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222357630.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 16232101661 in words is "sixteen billion, two hundred thirty-two million, one hundred one thousand, six hundred sixty-one".