16612540679821 has 4 divisors (see below), whose sum is σ = 16623115182144. Its totient is φ = 16601966177500.

The previous prime is 16612540679807. The next prime is 16612540679827. The reversal of 16612540679821 is 12897604521661.

16612540679821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 16612540679821 - 2²³ = 16612532291213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16612540679827) 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, 5287248805 + ... + 5287251946.

It is an arithmetic number, because the mean of its divisors is an integer number (4155778795536).

Almost surely, 2^{16612540679821} is an apocalyptic number.

It is an amenable number.

16612540679821 is a deficient number, since it is larger than the sum of its proper divisors (10574502323).

16612540679821 is a wasteful number, since it uses less digits than its factorization.

16612540679821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10574502322.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 16612540679821 in words is "sixteen trillion, six hundred twelve billion, five hundred forty million, six hundred seventy-nine thousand, eight hundred twenty-one".