637666434423 has 16 divisors (see below), whose sum is σ = 958790882560. Its totient is φ = 418766015448.

The previous prime is 637666434421. The next prime is 637666434439. The reversal of 637666434423 is 324434666736.

It is not a de Polignac number, because 637666434423 - 2¹ = 637666434421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 637666434423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637666434421) 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, 176246515 + ... + 176250132.

It is an arithmetic number, because the mean of its divisors is an integer number (59924430160).

Almost surely, 2^637666434423 is an apocalyptic number.

637666434423 is a deficient number, since it is larger than the sum of its proper divisors (321124448137).

637666434423 is a wasteful number, since it uses less digits than its factorization.

637666434423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352496723 (or 352496717 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 54.

The spelling of 637666434423 in words is "six hundred thirty-seven billion, six hundred sixty-six million, four hundred thirty-four thousand, four hundred twenty-three".