420992666 has 4 divisors (see below), whose sum is σ = 631489002. Its totient is φ = 210496332.

The previous prime is 420992653. The next prime is 420992669. The reversal of 420992666 is 666299024.

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., 298425625 + 122567041 = 17275^2 + 11071^2 .

It is not an unprimeable number, because it can be changed into a prime (420992669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105248165 + ... + 105248168.

Almost surely, 2^420992666 is an apocalyptic number.

420992666 is a deficient number, since it is larger than the sum of its proper divisors (210496336).

420992666 is a wasteful number, since it uses less digits than its factorization.

420992666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210496335.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 420992666 is about 20518.1058092603. The cubic root of 420992666 is about 749.4767704668.

The spelling of 420992666 in words is "four hundred twenty million, nine hundred ninety-two thousand, six hundred sixty-six".