16781137966 has 4 divisors (see below), whose sum is σ = 25171706952. Its totient is φ = 8390568982.

The previous prime is 16781137957. The next prime is 16781137979. The reversal of 16781137966 is 66973118761.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4195284490 + ... + 4195284493.

It is an arithmetic number, because the mean of its divisors is an integer number (6292926738).

Almost surely, 2^16781137966 is an apocalyptic number.

16781137966 is a deficient number, since it is larger than the sum of its proper divisors (8390568986).

16781137966 is an equidigital number, since it uses as much as digits as its factorization.

16781137966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8390568985.

The product of its digits is 2286144, while the sum is 55.

The spelling of 16781137966 in words is "sixteen billion, seven hundred eighty-one million, one hundred thirty-seven thousand, nine hundred sixty-six".