66424431420 has 36 divisors (see below), whose sum is σ = 201487442520. Its totient is φ = 17713181664.

The previous prime is 66424431401. The next prime is 66424431421. The reversal of 66424431420 is 2413442466.

66424431420 is a `hidden beast` number, since 6 + 642 + 4 + 4 + 3 + 1 + 4 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66424431421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184512130 + ... + 184512489.

Almost surely, 2^66424431420 is an apocalyptic number.

66424431420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66424431420 is an abundant number, since it is smaller than the sum of its proper divisors (135063011100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66424431420 is a wasteful number, since it uses less digits than its factorization.

66424431420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369024634 (or 369024629 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Adding to 66424431420 its reverse (2413442466), we get a palindrome (68837873886).

The spelling of 66424431420 in words is "sixty-six billion, four hundred twenty-four million, four hundred thirty-one thousand, four hundred twenty".