16661603235 has 16 divisors (see below), whose sum is σ = 27278532864. Its totient is φ = 8679532512.

The previous prime is 16661603227. The next prime is 16661603239. The reversal of 16661603235 is 53230616661.

It is a happy number.

It is not a de Polignac number, because 16661603235 - 2³ = 16661603227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16661603193 and 16661603202.

It is not an unprimeable number, because it can be changed into a prime (16661603239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12915327 + ... + 12916616.

It is an arithmetic number, because the mean of its divisors is an integer number (1704908304).

Almost surely, 2^16661603235 is an apocalyptic number.

16661603235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16661603235 is a deficient number, since it is larger than the sum of its proper divisors (10616929629).

16661603235 is a wasteful number, since it uses less digits than its factorization.

16661603235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25831994.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 16661603235 in words is "sixteen billion, six hundred sixty-one million, six hundred three thousand, two hundred thirty-five".