16336387661 has 4 divisors (see below), whose sum is σ = 17821513824. Its totient is φ = 14851261500.

The previous prime is 16336387607. The next prime is 16336387673. The reversal of 16336387661 is 16678363361.

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 a cyclic number.

It is not a de Polignac number, because 16336387661 - 2⁶ = 16336387597 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 (16336380661) 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, 742563065 + ... + 742563086.

It is an arithmetic number, because the mean of its divisors is an integer number (4455378456).

Almost surely, 2^16336387661 is an apocalyptic number.

16336387661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16336387661 is a deficient number, since it is larger than the sum of its proper divisors (1485126163).

16336387661 is a wasteful number, since it uses less digits than its factorization.

16336387661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485126162.

The product of its digits is 1959552, while the sum is 50.

The spelling of 16336387661 in words is "sixteen billion, three hundred thirty-six million, three hundred eighty-seven thousand, six hundred sixty-one".