420404061226661 has 8 divisors (see below), whose sum is σ = 421576683537240. Its totient is φ = 419232368466432.

The previous prime is 420404061226649. The next prime is 420404061226679. The reversal of 420404061226661 is 166622160404024.

It can be written as a sum of positive squares in 4 ways, for example, as 12842862685636 + 407561198541025 = 3583694^2 + 20188145^2 .

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 420404061226661 - 2²⁶ = 420403994117797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420404061286661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231481790 + ... + 233290863.

It is an arithmetic number, because the mean of its divisors is an integer number (52697085442155).

Almost surely, 2^{420404061226661} is an apocalyptic number.

It is an amenable number.

420404061226661 is a deficient number, since it is larger than the sum of its proper divisors (1172622310579).

420404061226661 is a wasteful number, since it uses less digits than its factorization.

420404061226661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464775175.

The product of its (nonzero) digits is 663552, while the sum is 44.

The spelling of 420404061226661 in words is "four hundred twenty trillion, four hundred four billion, sixty-one million, two hundred twenty-six thousand, six hundred sixty-one".