16908137965 has 4 divisors (see below), whose sum is σ = 20289765564. Its totient is φ = 13526510368.

The previous prime is 16908137957. The next prime is 16908138041. The reversal of 16908137965 is 56973180961.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4986336996 + 11921800969 = 70614^2 + 109187^2 .

It is a cyclic number.

It is not a de Polignac number, because 16908137965 - 2³ = 16908137957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690813792 + ... + 1690813801.

It is an arithmetic number, because the mean of its divisors is an integer number (5072441391).

Almost surely, 2^16908137965 is an apocalyptic number.

It is an amenable number.

16908137965 is a deficient number, since it is larger than the sum of its proper divisors (3381627599).

16908137965 is an equidigital number, since it uses as much as digits as its factorization.

16908137965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381627598.

The product of its (nonzero) digits is 2449440, while the sum is 55.

It can be divided in two parts, 169081 and 37965, that added together give a triangular number (207046 = T₆₄₃).

The spelling of 16908137965 in words is "sixteen billion, nine hundred eight million, one hundred thirty-seven thousand, nine hundred sixty-five".