423166638991 has 4 divisors (see below), whose sum is σ = 424661927752. Its totient is φ = 421671350232.

The previous prime is 423166638989. The next prime is 423166639019. The reversal of 423166638991 is 199836661324.

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

It is a cyclic number.

It is not a de Polignac number, because 423166638991 - 2¹ = 423166638989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423166638941) 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, 747643956 + ... + 747644521.

It is an arithmetic number, because the mean of its divisors is an integer number (106165481938).

Almost surely, 2^423166638991 is an apocalyptic number.

423166638991 is a deficient number, since it is larger than the sum of its proper divisors (1495288761).

423166638991 is a wasteful number, since it uses less digits than its factorization.

423166638991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495288760.

The product of its digits is 10077696, while the sum is 58.

The spelling of 423166638991 in words is "four hundred twenty-three billion, one hundred sixty-six million, six hundred thirty-eight thousand, nine hundred ninety-one".