641956623 has 32 divisors (see below), whose sum is σ = 1096005120. Its totient is φ = 324466560.

The previous prime is 641956621. The next prime is 641956631. The reversal of 641956623 is 326659146.

It is not a de Polignac number, because 641956623 - 2¹ = 641956621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641956621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29008 + ... + 46101.

It is an arithmetic number, because the mean of its divisors is an integer number (34250160).

Almost surely, 2^641956623 is an apocalyptic number.

641956623 is a deficient number, since it is larger than the sum of its proper divisors (454048497).

641956623 is a wasteful number, since it uses less digits than its factorization.

641956623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75167.

The product of its digits is 233280, while the sum is 42.

The square root of 641956623 is about 25336.8629273634. The cubic root of 641956623 is about 862.6511943304.

The spelling of 641956623 in words is "six hundred forty-one million, nine hundred fifty-six thousand, six hundred twenty-three".