16861981973 has 8 divisors (see below), whose sum is σ = 18024261696. Its totient is φ = 15735464800.

The previous prime is 16861981967. The next prime is 16861981999. The reversal of 16861981973 is 37918916861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16861981973 - 2¹⁶ = 16861916437 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861981933) 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 7 ways as a sum of consecutive naturals, for example, 8939663 + ... + 8941548.

It is an arithmetic number, because the mean of its divisors is an integer number (2253032712).

Almost surely, 2^16861981973 is an apocalyptic number.

It is an amenable number.

16861981973 is a deficient number, since it is larger than the sum of its proper divisors (1162279723).

16861981973 is a wasteful number, since it uses less digits than its factorization.

16861981973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17881275.

The product of its digits is 3919104, while the sum is 59.

The spelling of 16861981973 in words is "sixteen billion, eight hundred sixty-one million, nine hundred eighty-one thousand, nine hundred seventy-three".