981616166251803 has 24 divisors (see below), whose sum is σ = 1429114734215168. Its totient is φ = 649230573548592.

The previous prime is 981616166251789. The next prime is 981616166251807. The reversal of 981616166251803 is 308152661616189.

981616166251803 is a `hidden beast` number, since 9 + 8 + 1 + 6 + 1 + 616 + 6 + 2 + 5 + 1 + 8 + 0 + 3 = 666.

It is not a de Polignac number, because 981616166251803 - 2¹³ = 981616166243611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981616166251807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9052776 + ... + 45223722.

Almost surely, 2^{981616166251803} is an apocalyptic number.

981616166251803 is a deficient number, since it is larger than the sum of its proper divisors (447498567963365).

981616166251803 is a wasteful number, since it uses less digits than its factorization.

981616166251803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36194823 (or 36194820 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 981616166251803 in words is "nine hundred eighty-one trillion, six hundred sixteen billion, one hundred sixty-six million, two hundred fifty-one thousand, eight hundred three".