623441326661 has 4 divisors (see below), whose sum is σ = 623487137772. Its totient is φ = 623395515552.

The previous prime is 623441326643. The next prime is 623441326663. The reversal of 623441326661 is 166623144326.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 255738558436 + 367702768225 = 505706^2 + 606385^2 .

It is a cyclic number.

It is not a de Polignac number, because 623441326661 - 2¹⁸ = 623441064517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623441326663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22885136 + ... + 22912361.

It is an arithmetic number, because the mean of its divisors is an integer number (155871784443).

Almost surely, 2^623441326661 is an apocalyptic number.

It is an amenable number.

623441326661 is a deficient number, since it is larger than the sum of its proper divisors (45811111).

623441326661 is a wasteful number, since it uses less digits than its factorization.

623441326661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45811110.

The product of its digits is 746496, while the sum is 44.

The spelling of 623441326661 in words is "six hundred twenty-three billion, four hundred forty-one million, three hundred twenty-six thousand, six hundred sixty-one".