421773643617 has 16 divisors (see below), whose sum is σ = 592856850432. Its totient is φ = 266322407760.

The previous prime is 421773643591. The next prime is 421773643619. The reversal of 421773643617 is 716346377124.

It is not a de Polignac number, because 421773643617 - 2¹⁰ = 421773642593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421773643617.

It is not an unprimeable number, because it can be changed into a prime (421773643619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48242443 + ... + 48251184.

It is an arithmetic number, because the mean of its divisors is an integer number (37053553152).

Almost surely, 2^421773643617 is an apocalyptic number.

421773643617 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

421773643617 is a deficient number, since it is larger than the sum of its proper divisors (171083206815).

421773643617 is a wasteful number, since it uses less digits than its factorization.

421773643617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96493708.

The product of its digits is 3556224, while the sum is 51.

The spelling of 421773643617 in words is "four hundred twenty-one billion, seven hundred seventy-three million, six hundred forty-three thousand, six hundred seventeen".