423991798658 has 4 divisors (see below), whose sum is σ = 635987697990. Its totient is φ = 211995899328.

The previous prime is 423991798651. The next prime is 423991798661. The reversal of 423991798658 is 856897199324.

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

It can be written as a sum of positive squares in only one way, i.e., 411269537809 + 12722260849 = 641303^2 + 112793^2 .

It is a junction number, because it is equal to n+sod(n) for n = 423991798591 and 423991798600.

It is not an unprimeable number, because it can be changed into a prime (423991798651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105997949663 + ... + 105997949666.

Almost surely, 2^423991798658 is an apocalyptic number.

423991798658 is a deficient number, since it is larger than the sum of its proper divisors (211995899332).

423991798658 is a wasteful number, since it uses less digits than its factorization.

423991798658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211995899331.

The product of its digits is 235146240, while the sum is 71.

The spelling of 423991798658 in words is "four hundred twenty-three billion, nine hundred ninety-one million, seven hundred ninety-eight thousand, six hundred fifty-eight".