2159945965 has 8 divisors (see below), whose sum is σ = 2744402040. Its totient is φ = 1626312192.

The previous prime is 2159945899. The next prime is 2159945971. The reversal of 2159945965 is 5695499512.

It can be written as a sum of positive squares in 4 ways, for example, as 38975049 + 2120970916 = 6243^2 + 46054^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2159945965 - 2¹¹ = 2159943917 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12705480 + ... + 12705649.

It is an arithmetic number, because the mean of its divisors is an integer number (343050255).

Almost surely, 2^2159945965 is an apocalyptic number.

It is an amenable number.

2159945965 is a deficient number, since it is larger than the sum of its proper divisors (584456075).

2159945965 is a wasteful number, since it uses less digits than its factorization.

2159945965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25411151.

The product of its digits is 4374000, while the sum is 55.

The square root of 2159945965 is about 46475.2188268113. The cubic root of 2159945965 is about 1292.6500347738.

The spelling of 2159945965 in words is "two billion, one hundred fifty-nine million, nine hundred forty-five thousand, nine hundred sixty-five".