420666491 has 8 divisors (see below), whose sum is σ = 481577184. Its totient is φ = 359959680.

The previous prime is 420666473. The next prime is 420666503. The reversal of 420666491 is 194666024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420666491 - 2⁶ = 420666427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420666451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46520 + ... + 54821.

It is an arithmetic number, because the mean of its divisors is an integer number (60197148).

Almost surely, 2^420666491 is an apocalyptic number.

420666491 is a deficient number, since it is larger than the sum of its proper divisors (60910693).

420666491 is a wasteful number, since it uses less digits than its factorization.

420666491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101941.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 420666491 is about 20510.1558014560. The cubic root of 420666491 is about 749.2831615937.

The spelling of 420666491 in words is "four hundred twenty million, six hundred sixty-six thousand, four hundred ninety-one".