16436778436 has 27 divisors (see below), whose sum is σ = 31153526733. Its totient is φ = 7584666960.

The previous prime is 16436778433. The next prime is 16436778461. The reversal of 16436778436 is 63487763461.

The square root of 16436778436 is 128206.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2431476100 + 14005302336 = 49310^2 + 118344^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16436778431) 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 8 ways as a sum of consecutive naturals, for example, 3330891 + ... + 3335821.

Almost surely, 2^16436778436 is an apocalyptic number.

16436778436 is the 128206-th square number.

It is an amenable number.

16436778436 is a deficient number, since it is larger than the sum of its proper divisors (14716748297).

16436778436 is an frugal number, since it uses more digits than its factorization.

16436778436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9892 (or 4946 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 55.

The spelling of 16436778436 in words is "sixteen billion, four hundred thirty-six million, seven hundred seventy-eight thousand, four hundred thirty-six".