16061511621 has 4 divisors (see below), whose sum is σ = 21415348832. Its totient is φ = 10707674412.

The previous prime is 16061511601. The next prime is 16061511643. The reversal of 16061511621 is 12611516061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16061511621 - 2⁷ = 16061511493 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 (16061511601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2676918601 + ... + 2676918606.

It is an arithmetic number, because the mean of its divisors is an integer number (5353837208).

Almost surely, 2^16061511621 is an apocalyptic number.

It is an amenable number.

16061511621 is a deficient number, since it is larger than the sum of its proper divisors (5353837211).

16061511621 is an equidigital number, since it uses as much as digits as its factorization.

16061511621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353837210.

The product of its (nonzero) digits is 2160, while the sum is 30.

The spelling of 16061511621 in words is "sixteen billion, sixty-one million, five hundred eleven thousand, six hundred twenty-one".