426430666 has 4 divisors (see below), whose sum is σ = 639646002. Its totient is φ = 213215332.

The previous prime is 426430651. The next prime is 426430673. The reversal of 426430666 is 666034624.

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., 404854641 + 21576025 = 20121^2 + 4645^2 .

It is a super-2 number, since 2×426430666² = 363686225810407112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106607665 + ... + 106607668.

Almost surely, 2^426430666 is an apocalyptic number.

426430666 is a deficient number, since it is larger than the sum of its proper divisors (213215336).

426430666 is a wasteful number, since it uses less digits than its factorization.

426430666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213215335.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 426430666 is about 20650.1977230243. The cubic root of 426430666 is about 752.6899942987.

The spelling of 426430666 in words is "four hundred twenty-six million, four hundred thirty thousand, six hundred sixty-six".