1665506063 has 4 divisors (see below), whose sum is σ = 1793621928. Its totient is φ = 1537390200.

The previous prime is 1665506041. The next prime is 1665506069. The reversal of 1665506063 is 3606055661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1665506063 - 2²⁴ = 1648728847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665506069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64057913 + ... + 64057938.

It is an arithmetic number, because the mean of its divisors is an integer number (448405482).

Almost surely, 2^1665506063 is an apocalyptic number.

1665506063 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1665506063 is a deficient number, since it is larger than the sum of its proper divisors (128115865).

1665506063 is a wasteful number, since it uses less digits than its factorization.

1665506063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128115864.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 1665506063 is about 40810.6121370410. The cubic root of 1665506063 is about 1185.3558280294.

The spelling of 1665506063 in words is "one billion, six hundred sixty-five million, five hundred six thousand, sixty-three".