421766860166018 has 4 divisors (see below), whose sum is σ = 632650290249030. Its totient is φ = 210883430083008.

The previous prime is 421766860165997. The next prime is 421766860166053. The reversal of 421766860166018 is 810661068667124.

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

It can be written as a sum of positive squares in only one way, i.e., 394362127253809 + 27404732912209 = 19858553^2 + 5234953^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105441715041503 + ... + 105441715041506.

Almost surely, 2^{421766860166018} is an apocalyptic number.

421766860166018 is a deficient number, since it is larger than the sum of its proper divisors (210883430083012).

421766860166018 is a wasteful number, since it uses less digits than its factorization.

421766860166018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210883430083011.

The product of its (nonzero) digits is 27869184, while the sum is 62.

The spelling of 421766860166018 in words is "four hundred twenty-one trillion, seven hundred sixty-six billion, eight hundred sixty million, one hundred sixty-six thousand, eighteen".