Base | Representation |
---|---|
bin | 10010101001100011010… |
… | …10100111110100111111 |
3 | 2021020222021222121122011 |
4 | 21110301222213310333 |
5 | 40444311021240441 |
6 | 1210212151432051 |
7 | 64203131615551 |
oct | 11246152476477 |
9 | 2236867877564 |
10 | 640783383871 |
11 | 227833573524 |
12 | a4231085627 |
13 | 4856c0c5807 |
14 | 2302a8d34d1 |
15 | 11a054e8581 |
hex | 9531aa7d3f |
640783383871 has 4 divisors (see below), whose sum is σ = 640874192032. Its totient is φ = 640692575712.
The previous prime is 640783383841. The next prime is 640783383881. The reversal of 640783383871 is 178383387046.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 640783383871 - 219 = 640782859583 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (640783383841) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45393495 + ... + 45407608.
It is an arithmetic number, because the mean of its divisors is an integer number (160218548008).
Almost surely, 2640783383871 is an apocalyptic number.
640783383871 is a deficient number, since it is larger than the sum of its proper divisors (90808161).
640783383871 is an equidigital number, since it uses as much as digits as its factorization.
640783383871 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 90808160.
The product of its (nonzero) digits is 16257024, while the sum is 58.
The spelling of 640783383871 in words is "six hundred forty billion, seven hundred eighty-three million, three hundred eighty-three thousand, eight hundred seventy-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.064 sec. • engine limits •