16515050661 has 8 divisors (see below), whose sum is σ = 24466741760. Its totient is φ = 11010033756.

The previous prime is 16515050647. The next prime is 16515050689. The reversal of 16515050661 is 16605051561.

It is not a de Polignac number, because 16515050661 - 2⁷ = 16515050533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16515050611) 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, 305834245 + ... + 305834298.

It is an arithmetic number, because the mean of its divisors is an integer number (3058342720).

Almost surely, 2^16515050661 is an apocalyptic number.

It is an amenable number.

16515050661 is a deficient number, since it is larger than the sum of its proper divisors (7951691099).

16515050661 is an equidigital number, since it uses as much as digits as its factorization.

16515050661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611668552 (or 611668546 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 16515050661 in words is "sixteen billion, five hundred fifteen million, fifty thousand, six hundred sixty-one".