420657665766 has 48 divisors (see below), whose sum is σ = 911954317824. Its totient is φ = 129298976352.

The previous prime is 420657665749. The next prime is 420657665833. The reversal of 420657665766 is 667566756024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 766035 + ... + 1195041.

It is an arithmetic number, because the mean of its divisors is an integer number (18999048288).

Almost surely, 2^420657665766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420657665766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455977158912).

420657665766 is an abundant number, since it is smaller than the sum of its proper divisors (491296652058).

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

420657665766 is a wasteful number, since it uses less digits than its factorization.

420657665766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430005 (or 429992 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 60.

The spelling of 420657665766 in words is "four hundred twenty billion, six hundred fifty-seven million, six hundred sixty-five thousand, seven hundred sixty-six".