640105102231 has 8 divisors (see below), whose sum is σ = 731794941824. Its totient is φ = 548476826040.

The previous prime is 640105102207. The next prime is 640105102243. The reversal of 640105102231 is 132201501046.

It is a happy number.

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 640105102231 - 2¹¹ = 640105100183 is a prime.

It is a super-2 number, since 2×640105102231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640105102196 and 640105102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640105102331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15368565 + ... + 15410158.

It is an arithmetic number, because the mean of its divisors is an integer number (91474367728).

Almost surely, 2^640105102231 is an apocalyptic number.

640105102231 is a deficient number, since it is larger than the sum of its proper divisors (91689839593).

640105102231 is a wasteful number, since it uses less digits than its factorization.

640105102231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30781701.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 640105102231 its reverse (132201501046), we get a palindrome (772306603277).

The spelling of 640105102231 in words is "six hundred forty billion, one hundred five million, one hundred two thousand, two hundred thirty-one".