420660261 has 12 divisors (see below), whose sum is σ = 694423392. Its totient is φ = 240377256.

The previous prime is 420660259. The next prime is 420660263. The reversal of 420660261 is 162066024.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (420660259) and next prime (420660263).

It is not a de Polignac number, because 420660261 - 2¹ = 420660259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420660263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3338511 + ... + 3338636.

It is an arithmetic number, because the mean of its divisors is an integer number (57868616).

Almost surely, 2^420660261 is an apocalyptic number.

It is an amenable number.

420660261 is a deficient number, since it is larger than the sum of its proper divisors (273763131).

420660261 is a wasteful number, since it uses less digits than its factorization.

420660261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6677160 (or 6677157 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 420660261 is about 20510.0039249143. The cubic root of 420660261 is about 749.2794626563.

The spelling of 420660261 in words is "four hundred twenty million, six hundred sixty thousand, two hundred sixty-one".