16650121012 has 18 divisors (see below), whose sum is σ = 33894889602. Its totient is φ = 7135766064.

The previous prime is 16650121009. The next prime is 16650121013. The reversal of 16650121012 is 21012105661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16513792036 + 136328976 = 128506^2 + 11676^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16650121013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42474603 + ... + 42474994.

Almost surely, 2^16650121012 is an apocalyptic number.

It is an amenable number.

16650121012 is an abundant number, since it is smaller than the sum of its proper divisors (17244768590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16650121012 is a wasteful number, since it uses less digits than its factorization.

16650121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84949615 (or 84949606 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 16650121012 its reverse (21012105661), we get a palindrome (37662226673).

The spelling of 16650121012 in words is "sixteen billion, six hundred fifty million, one hundred twenty-one thousand, twelve".