16396903377481 has 27 divisors (see below), whose sum is σ = 18162317194567. Its totient is φ = 14791963804640.

The previous prime is 16396903377427. The next prime is 16396903377487. The reversal of 16396903377481 is 18477330969361.

The square root of 16396903377481 is 4049309.

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., 9631619145225 + 6765284232256 = 3103485^2 + 2601016^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16396903377481 is a prime.

It is a super-2 number, since 2×16396903377481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16396903377487) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6102307320 + ... + 6102310006.

Almost surely, 2^{16396903377481} is an apocalyptic number.

16396903377481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16396903377481 is the 4049309-th square number.

16396903377481 is the 2024655-th centered octagonal number.

It is an amenable number.

16396903377481 is a deficient number, since it is larger than the sum of its proper divisors (1765413817086).

16396903377481 is an frugal number, since it uses more digits than its factorization.

16396903377481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5670 (or 2835 counting only the distinct ones).

The product of its (nonzero) digits is 123451776, while the sum is 67.

The spelling of 16396903377481 in words is "sixteen trillion, three hundred ninety-six billion, nine hundred three million, three hundred seventy-seven thousand, four hundred eighty-one".