16431785757 has 12 divisors (see below), whose sum is σ = 24123897564. Its totient is φ = 10774941120.

The previous prime is 16431785719. The next prime is 16431785759. The reversal of 16431785757 is 75758713461.

16431785757 is a `hidden beast` number, since 1 + 64 + 3 + 1 + 7 + 8 + 575 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7214633721 + 9217152036 = 84939^2 + 96006^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16431785757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16431785759) 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 11 ways as a sum of consecutive naturals, for example, 14964648 + ... + 14965745.

It is an arithmetic number, because the mean of its divisors is an integer number (2010324797).

Almost surely, 2^16431785757 is an apocalyptic number.

It is an amenable number.

16431785757 is a deficient number, since it is larger than the sum of its proper divisors (7692111807).

16431785757 is a wasteful number, since it uses less digits than its factorization.

16431785757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29930460 (or 29930457 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 54.

The spelling of 16431785757 in words is "sixteen billion, four hundred thirty-one million, seven hundred eighty-five thousand, seven hundred fifty-seven".