16606903634 has 4 divisors (see below), whose sum is σ = 24910355454. Its totient is φ = 8303451816.

The previous prime is 16606903633. The next prime is 16606903657. The reversal of 16606903634 is 43630960661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43630960661 = 37 ⋅1179215153.

It can be written as a sum of positive squares in only one way, i.e., 11516509225 + 5090394409 = 107315^2 + 71347^2 .

It is not an unprimeable number, because it can be changed into a prime (16606903631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4151725907 + ... + 4151725910.

Almost surely, 2^16606903634 is an apocalyptic number.

16606903634 is a deficient number, since it is larger than the sum of its proper divisors (8303451820).

16606903634 is an equidigital number, since it uses as much as digits as its factorization.

16606903634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8303451819.

The product of its (nonzero) digits is 419904, while the sum is 44.

The spelling of 16606903634 in words is "sixteen billion, six hundred six million, nine hundred three thousand, six hundred thirty-four".