427662661 has 4 divisors (see below), whose sum is σ = 429241024. Its totient is φ = 426084300.

The previous prime is 427662647. The next prime is 427662673. The reversal of 427662661 is 166266724.

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 427662661 - 2¹⁵ = 427629893 is a prime.

It is a super-2 number, since 2×427662661² = 365790703227201842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427662601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788775 + ... + 789316.

It is an arithmetic number, because the mean of its divisors is an integer number (107310256).

Almost surely, 2^427662661 is an apocalyptic number.

It is an amenable number.

427662661 is a deficient number, since it is larger than the sum of its proper divisors (1578363).

427662661 is a wasteful number, since it uses less digits than its factorization.

427662661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578362.

The product of its digits is 145152, while the sum is 40.

The square root of 427662661 is about 20680.0063104439. The cubic root of 427662661 is about 753.4141594737.

The spelling of 427662661 in words is "four hundred twenty-seven million, six hundred sixty-two thousand, six hundred sixty-one".