420135666640 has 80 divisors (see below), whose sum is σ = 1008481453056. Its totient is φ = 162608025600.

The previous prime is 420135666581. The next prime is 420135666647. The reversal of 420135666640 is 46666531024.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420135666647) 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, 28961629 + ... + 28976131.

Almost surely, 2^420135666640 is an apocalyptic number.

420135666640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420135666640 is an abundant number, since it is smaller than the sum of its proper divisors (588345786416).

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

420135666640 is a wasteful number, since it uses less digits than its factorization.

420135666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26228 (or 26222 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 420135666640 in words is "four hundred twenty billion, one hundred thirty-five million, six hundred sixty-six thousand, six hundred forty".