420244644666 has 256 divisors, whose sum is σ = 1073892556800. Its totient is φ = 106492320000.

The previous prime is 420244644661. The next prime is 420244644679. The reversal of 420244644666 is 666446442024.

It is a super-2 number, since 2×420244644666² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420244644661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1550718111 + ... + 1550718381.

It is an arithmetic number, because the mean of its divisors is an integer number (4194892800).

Almost surely, 2^420244644666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420244644666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (536946278400).

420244644666 is an abundant number, since it is smaller than the sum of its proper divisors (653647912134).

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

420244644666 is a wasteful number, since it uses less digits than its factorization.

420244644666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761.

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 420244644666 in words is "four hundred twenty billion, two hundred forty-four million, six hundred forty-four thousand, six hundred sixty-six".