16264989621 has 40 divisors (see below), whose sum is σ = 24725933760. Its totient is φ = 10653104448.

The previous prime is 16264989617. The next prime is 16264989647. The reversal of 16264989621 is 12698946261.

16264989621 is a `hidden beast` number, since 1 + 6 + 2 + 6 + 4 + 9 + 8 + 9 + 621 = 666.

It is not a de Polignac number, because 16264989621 - 2² = 16264989617 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16264987621) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1549890 + ... + 1560348.

It is an arithmetic number, because the mean of its divisors is an integer number (618148344).

Almost surely, 2^16264989621 is an apocalyptic number.

It is an amenable number.

16264989621 is a deficient number, since it is larger than the sum of its proper divisors (8460944139).

16264989621 is a wasteful number, since it uses less digits than its factorization.

16264989621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10807 (or 10798 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 16264989621 in words is "sixteen billion, two hundred sixty-four million, nine hundred eighty-nine thousand, six hundred twenty-one".