2691944945 has 16 divisors (see below), whose sum is σ = 3288392208. Its totient is φ = 2114960640.

The previous prime is 2691944933. The next prime is 2691944989. The reversal of 2691944945 is 5494491962.

2691944945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 13778944 + 2678166001 = 3712^2 + 51751^2 .

It is not a de Polignac number, because 2691944945 - 2¹⁶ = 2691879409 is a prime.

It is a super-2 number, since 2×2691944945² = 14493135173822106050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199967 + ... + 213003.

It is an arithmetic number, because the mean of its divisors is an integer number (205524513).

Almost surely, 2^2691944945 is an apocalyptic number.

It is an amenable number.

2691944945 is a deficient number, since it is larger than the sum of its proper divisors (596447263).

2691944945 is a wasteful number, since it uses less digits than its factorization.

2691944945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13780.

The product of its digits is 2799360, while the sum is 53.

The square root of 2691944945 is about 51883.9565280058. The cubic root of 2691944945 is about 1391.0905206067.

The spelling of 2691944945 in words is "two billion, six hundred ninety-one million, nine hundred forty-four thousand, nine hundred forty-five".