16391431782 has 32 divisors (see below), whose sum is σ = 39736805760. Its totient is φ = 4967100360.

The previous prime is 16391431747. The next prime is 16391431783. The reversal of 16391431782 is 28713419361.

16391431782 is a `hidden beast` number, since 1 + 63 + 91 + 431 + 78 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16391431783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13796908 + ... + 13798095.

It is an arithmetic number, because the mean of its divisors is an integer number (1241775180).

Almost surely, 2^16391431782 is an apocalyptic number.

16391431782 is an abundant number, since it is smaller than the sum of its proper divisors (23345373978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16391431782 is a wasteful number, since it uses less digits than its factorization.

16391431782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27595025 (or 27595019 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 16391431782 in words is "sixteen billion, three hundred ninety-one million, four hundred thirty-one thousand, seven hundred eighty-two".