16421102553661 has 8 divisors (see below), whose sum is σ = 17696061684000. Its totient is φ = 15147828765552.

The previous prime is 16421102553649. The next prime is 16421102553701. The reversal of 16421102553661 is 16635520112461.

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

It is a cyclic number.

It is not a de Polignac number, because 16421102553661 - 2²⁵ = 16421068999229 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 (16421102553461) 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, 421315315 + ... + 421354288.

It is an arithmetic number, because the mean of its divisors is an integer number (2212007710500).

Almost surely, 2^{16421102553661} is an apocalyptic number.

It is an amenable number.

16421102553661 is a deficient number, since it is larger than the sum of its proper divisors (1274959130339).

16421102553661 is a wasteful number, since it uses less digits than its factorization.

16421102553661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842671115.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 16421102553661 in words is "sixteen trillion, four hundred twenty-one billion, one hundred two million, five hundred fifty-three thousand, six hundred sixty-one".