15997210166603 has 4 divisors (see below), whose sum is σ = 15997255309200. Its totient is φ = 15997165024008.

The previous prime is 15997210166551. The next prime is 15997210166627. The reversal of 15997210166603 is 30666101279951.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15997210166603 is a prime.

It is a super-2 number, since 2×15997210166603² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15997210166683) 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 3 ways as a sum of consecutive naturals, for example, 22035503 + ... + 22749896.

It is an arithmetic number, because the mean of its divisors is an integer number (3999313827300).

Almost surely, 2^{15997210166603} is an apocalyptic number.

15997210166603 is a deficient number, since it is larger than the sum of its proper divisors (45142597).

15997210166603 is an equidigital number, since it uses as much as digits as its factorization.

15997210166603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45142596.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 15997210166603 in words is "fifteen trillion, nine hundred ninety-seven billion, two hundred ten million, one hundred sixty-six thousand, six hundred three".