16442615642621 has 8 divisors (see below), whose sum is σ = 18791586690624. Its totient is φ = 14093651083680.

The previous prime is 16442615642573. The next prime is 16442615642627. The reversal of 16442615642621 is 12624651624461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-16442615642621 is a prime.

It is a super-3 number, since 3×16442615642621³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16442615642621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16442615642627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6556361 + ... + 8710401.

It is an arithmetic number, because the mean of its divisors is an integer number (2348948336328).

Almost surely, 2^{16442615642621} is an apocalyptic number.

It is an amenable number.

16442615642621 is a deficient number, since it is larger than the sum of its proper divisors (2348971048003).

16442615642621 is a wasteful number, since it uses less digits than its factorization.

16442615642621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244531.

The product of its digits is 3317760, while the sum is 50.

The spelling of 16442615642621 in words is "sixteen trillion, four hundred forty-two billion, six hundred fifteen million, six hundred forty-two thousand, six hundred twenty-one".