641552623 has 4 divisors (see below), whose sum is σ = 641622688. Its totient is φ = 641482560.

The previous prime is 641552617. The next prime is 641552669. The reversal of 641552623 is 326255146.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641552623 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 (641552683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18786 + ... + 40447.

It is an arithmetic number, because the mean of its divisors is an integer number (160405672).

Almost surely, 2^641552623 is an apocalyptic number.

641552623 is a deficient number, since it is larger than the sum of its proper divisors (70065).

641552623 is a wasteful number, since it uses less digits than its factorization.

641552623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70064.

The product of its digits is 43200, while the sum is 34.

The square root of 641552623 is about 25328.8890992084. The cubic root of 641552623 is about 862.4701934109.

The spelling of 641552623 in words is "six hundred forty-one million, five hundred fifty-two thousand, six hundred twenty-three".