16436694415981 has 16 divisors (see below), whose sum is σ = 18801231393280. Its totient is φ = 14076269475840.

The previous prime is 16436694415957. The next prime is 16436694416027. The reversal of 16436694415981 is 18951449663461.

It is a cyclic number.

It is not a de Polignac number, because 16436694415981 - 2⁷ = 16436694415853 is a prime.

It is a super-2 number, since 2×16436694415981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16436694415081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79605805 + ... + 79812013.

It is an arithmetic number, because the mean of its divisors is an integer number (1175076962080).

Almost surely, 2^{16436694415981} is an apocalyptic number.

It is an amenable number.

16436694415981 is a deficient number, since it is larger than the sum of its proper divisors (2364536977299).

16436694415981 is a wasteful number, since it uses less digits than its factorization.

16436694415981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216124.

The product of its digits is 134369280, while the sum is 67.

The spelling of 16436694415981 in words is "sixteen trillion, four hundred thirty-six billion, six hundred ninety-four million, four hundred fifteen thousand, nine hundred eighty-one".