16781545972 has 6 divisors (see below), whose sum is σ = 29367705458. Its totient is φ = 8390772984.

The previous prime is 16781545961. The next prime is 16781545987. The reversal of 16781545972 is 27954518761.

It can be written as a sum of positive squares in only one way, i.e., 15824633616 + 956912356 = 125796^2 + 30934^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2097693243 + ... + 2097693250.

Almost surely, 2^16781545972 is an apocalyptic number.

It is an amenable number.

16781545972 is a deficient number, since it is larger than the sum of its proper divisors (12586159486).

16781545972 is a wasteful number, since it uses less digits than its factorization.

16781545972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195386497 (or 4195386495 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 55.

The spelling of 16781545972 in words is "sixteen billion, seven hundred eighty-one million, five hundred forty-five thousand, nine hundred seventy-two".