1420660665 has 48 divisors (see below), whose sum is σ = 2604880512. Its totient is φ = 714776832.

The previous prime is 1420660651. The next prime is 1420660667. The reversal of 1420660665 is 5660660241.

It is a happy number.

1420660665 is a `hidden beast` number, since 1 + 42 + 0 + 6 + 606 + 6 + 5 = 666.

It is not a de Polignac number, because 1420660665 - 2⁴ = 1420660649 is a prime.

It is a super-3 number, since 3×1420660665³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1420660667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66154 + ... + 84956.

It is an arithmetic number, because the mean of its divisors is an integer number (54268344).

Almost surely, 2^1420660665 is an apocalyptic number.

1420660665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1420660665 is a deficient number, since it is larger than the sum of its proper divisors (1184219847).

1420660665 is a wasteful number, since it uses less digits than its factorization.

1420660665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18910 (or 18907 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1420660665 is about 37691.6524578056. The cubic root of 1420660665 is about 1124.1651524759.

The spelling of 1420660665 in words is "one billion, four hundred twenty million, six hundred sixty thousand, six hundred sixty-five".