16121535325604 has 6 divisors (see below), whose sum is σ = 28212686819814. Its totient is φ = 8060767662800.

The previous prime is 16121535325603. The next prime is 16121535325619. The reversal of 16121535325604 is 40652353512161.

It is a happy number.

16121535325604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 15369849793600 + 751685532004 = 3920440^2 + 866998^2 .

It is not an unprimeable number, because it can be changed into a prime (16121535325603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2015191915697 + ... + 2015191915704.

It is an arithmetic number, because the mean of its divisors is an integer number (4702114469969).

Almost surely, 2^{16121535325604} is an apocalyptic number.

It is an amenable number.

16121535325604 is a deficient number, since it is larger than the sum of its proper divisors (12091151494210).

16121535325604 is a wasteful number, since it uses less digits than its factorization.

16121535325604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030383831405 (or 4030383831403 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

Adding to 16121535325604 its reverse (40652353512161), we get a palindrome (56773888837765).

The spelling of 16121535325604 in words is "sixteen trillion, one hundred twenty-one billion, five hundred thirty-five million, three hundred twenty-five thousand, six hundred four".