16330403661 has 16 divisors (see below), whose sum is σ = 25580493120. Its totient is φ = 9135889920.

The previous prime is 16330403641. The next prime is 16330403729. The reversal of 16330403661 is 16630403361.

It is not a de Polignac number, because 16330403661 - 2⁶ = 16330403597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16330403641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19032676 + ... + 19033533.

It is an arithmetic number, because the mean of its divisors is an integer number (1598780820).

Almost surely, 2^16330403661 is an apocalyptic number.

16330403661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16330403661 is a deficient number, since it is larger than the sum of its proper divisors (9250089459).

16330403661 is a wasteful number, since it uses less digits than its factorization.

16330403661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38066236.

The product of its (nonzero) digits is 23328, while the sum is 33.

The spelling of 16330403661 in words is "sixteen billion, three hundred thirty million, four hundred three thousand, six hundred sixty-one".