16361332621 has 8 divisors (see below), whose sum is σ = 16606897560. Its totient is φ = 16117503552.

The previous prime is 16361332553. The next prime is 16361332703. The reversal of 16361332621 is 12623316361.

It can be written as a sum of positive squares in 4 ways, for example, as 7406495721 + 8954836900 = 86061^2 + 94630^2 .

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 16361332621 - 2⁹ = 16361332109 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 (16361332021) 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, 414970 + ... + 452683.

It is an arithmetic number, because the mean of its divisors is an integer number (2075862195).

Almost surely, 2^16361332621 is an apocalyptic number.

It is an amenable number.

16361332621 is a deficient number, since it is larger than the sum of its proper divisors (245564939).

16361332621 is a wasteful number, since it uses less digits than its factorization.

16361332621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867935.

The product of its digits is 23328, while the sum is 34.

Adding to 16361332621 its reverse (12623316361), we get a palindrome (28984648982).

The spelling of 16361332621 in words is "sixteen billion, three hundred sixty-one million, three hundred thirty-two thousand, six hundred twenty-one".