16621134406 has 16 divisors (see below), whose sum is σ = 25794616320. Its totient is φ = 8024151240.

The previous prime is 16621134401. The next prime is 16621134449. The reversal of 16621134406 is 60443112661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621134401) 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, 278116 + ... + 332551.

It is an arithmetic number, because the mean of its divisors is an integer number (1612163520).

Almost surely, 2^16621134406 is an apocalyptic number.

16621134406 is a deficient number, since it is larger than the sum of its proper divisors (9173481914).

16621134406 is a wasteful number, since it uses less digits than its factorization.

16621134406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611139.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 16621134406 in words is "sixteen billion, six hundred twenty-one million, one hundred thirty-four thousand, four hundred six".