1427216665 has 16 divisors (see below), whose sum is σ = 1967476608. Its totient is φ = 973587456.

The previous prime is 1427216663. The next prime is 1427216671. The reversal of 1427216665 is 5666127241.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1427216665 - 2¹ = 1427216663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1427216663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98887 + ... + 112396.

It is an arithmetic number, because the mean of its divisors is an integer number (122967288).

Almost surely, 2^1427216665 is an apocalyptic number.

It is an amenable number.

1427216665 is a deficient number, since it is larger than the sum of its proper divisors (540259943).

1427216665 is a wasteful number, since it uses less digits than its factorization.

1427216665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211488.

The product of its digits is 120960, while the sum is 40.

The square root of 1427216665 is about 37778.5212124562. The cubic root of 1427216665 is about 1125.8917479354.

The spelling of 1427216665 in words is "one billion, four hundred twenty-seven million, two hundred sixteen thousand, six hundred sixty-five".