16621456406135 has 16 divisors (see below), whose sum is σ = 22795340875776. Its totient is φ = 11397469776288.

The previous prime is 16621456406063. The next prime is 16621456406147. The reversal of 16621456406135 is 53160465412661.

It is a cyclic number.

It is not a de Polignac number, because 16621456406135 - 2²⁸ = 16621187970679 is a prime.

It is a super-2 number, since 2×16621456406135² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2058554 + ... + 6122136.

It is an arithmetic number, because the mean of its divisors is an integer number (1424708804736).

Almost surely, 2^{16621456406135} is an apocalyptic number.

16621456406135 is a deficient number, since it is larger than the sum of its proper divisors (6173884469641).

16621456406135 is a wasteful number, since it uses less digits than its factorization.

16621456406135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180462.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 16621456406135 in words is "sixteen trillion, six hundred twenty-one billion, four hundred fifty-six million, four hundred six thousand, one hundred thirty-five".