640523103 has 16 divisors (see below), whose sum is σ = 939012096. Its totient is φ = 385136640.

The previous prime is 640523099. The next prime is 640523167. The reversal of 640523103 is 301325046.

It is a happy number.

It is not a de Polignac number, because 640523103 - 2² = 640523099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640523173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72226 + ... + 80607.

It is an arithmetic number, because the mean of its divisors is an integer number (58688256).

Almost surely, 2^640523103 is an apocalyptic number.

640523103 is a deficient number, since it is larger than the sum of its proper divisors (298488993).

640523103 is a wasteful number, since it uses less digits than its factorization.

640523103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152974.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 640523103 is about 25308.5579004415. The cubic root of 640523103 is about 862.0086019171.

Adding to 640523103 its reverse (301325046), we get a palindrome (941848149).

The spelling of 640523103 in words is "six hundred forty million, five hundred twenty-three thousand, one hundred three".