420766161 has 4 divisors (see below), whose sum is σ = 561021552. Its totient is φ = 280510772.

The previous prime is 420766147. The next prime is 420766169. The reversal of 420766161 is 161667024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420766161 - 2¹⁵ = 420733393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (420766169) 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, 70127691 + ... + 70127696.

It is an arithmetic number, because the mean of its divisors is an integer number (140255388).

Almost surely, 2^420766161 is an apocalyptic number.

It is an amenable number.

420766161 is a deficient number, since it is larger than the sum of its proper divisors (140255391).

420766161 is a wasteful number, since it uses less digits than its factorization.

420766161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140255390.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 420766161 is about 20512.5854294382. The cubic root of 420766161 is about 749.3423336908.

The spelling of 420766161 in words is "four hundred twenty million, seven hundred sixty-six thousand, one hundred sixty-one".