6940390161 has 4 divisors (see below), whose sum is σ = 9253853552. Its totient is φ = 4626926772.

The previous prime is 6940390159. The next prime is 6940390213. The reversal of 6940390161 is 1610930496.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6940390161 - 2¹ = 6940390159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6940390151) 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 3 ways as a sum of consecutive naturals, for example, 1156731691 + ... + 1156731696.

It is an arithmetic number, because the mean of its divisors is an integer number (2313463388).

Almost surely, 2^6940390161 is an apocalyptic number.

It is an amenable number.

6940390161 is a deficient number, since it is larger than the sum of its proper divisors (2313463391).

6940390161 is a wasteful number, since it uses less digits than its factorization.

6940390161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313463390.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 6940390161 is about 83309.0040811916. The cubic root of 6940390161 is about 1907.4857189655.

The spelling of 6940390161 in words is "six billion, nine hundred forty million, three hundred ninety thousand, one hundred sixty-one".