420522661 has 4 divisors (see below), whose sum is σ = 452870572. Its totient is φ = 388174752.

The previous prime is 420522653. The next prime is 420522667. The reversal of 420522661 is 166225024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173844225 + 246678436 = 13185^2 + 15706^2 .

It is a cyclic number.

It is not a de Polignac number, because 420522661 - 2³ = 420522653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420522667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16173936 + ... + 16173961.

It is an arithmetic number, because the mean of its divisors is an integer number (113217643).

Almost surely, 2^420522661 is an apocalyptic number.

It is an amenable number.

420522661 is a deficient number, since it is larger than the sum of its proper divisors (32347911).

420522661 is a wasteful number, since it uses less digits than its factorization.

420522661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32347910.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 420522661 is about 20506.6491899579. The cubic root of 420522661 is about 749.1977561049.

Adding to 420522661 its reverse (166225024), we get a palindrome (586747685).

The spelling of 420522661 in words is "four hundred twenty million, five hundred twenty-two thousand, six hundred sixty-one".