423644172544 has 18 divisors (see below), whose sum is σ = 845633485550. Its totient is φ = 211822086144.

The previous prime is 423644172529. The next prime is 423644172613. The reversal of 423644172544 is 445271446324.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 422645612544 + 998560000 = 650112^2 + 31600^2 .

It is a junction number, because it is equal to n+sod(n) for n = 423644172494 and 423644172503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827429769 + ... + 827430280.

Almost surely, 2^423644172544 is an apocalyptic number.

It is an amenable number.

423644172544 is a deficient number, since it is larger than the sum of its proper divisors (421989313006).

423644172544 is an equidigital number, since it uses as much as digits as its factorization.

423644172544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654860065 (or 1654860051 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 46.

The spelling of 423644172544 in words is "four hundred twenty-three billion, six hundred forty-four million, one hundred seventy-two thousand, five hundred forty-four".