1668137263 has 8 divisors (see below), whose sum is σ = 1800610448. Its totient is φ = 1536257664.

The previous prime is 1668137239. The next prime is 1668137269. The reversal of 1668137263 is 3627318661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668137263 - 2⁵ = 1668137231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668137269) 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 7 ways as a sum of consecutive naturals, for example, 142545 + ... + 153802.

It is an arithmetic number, because the mean of its divisors is an integer number (225076306).

Almost surely, 2^1668137263 is an apocalyptic number.

1668137263 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1668137263 is a deficient number, since it is larger than the sum of its proper divisors (132473185).

1668137263 is a wasteful number, since it uses less digits than its factorization.

1668137263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296793.

The product of its digits is 217728, while the sum is 43.

The square root of 1668137263 is about 40842.8361282612. The cubic root of 1668137263 is about 1185.9797159327.

The spelling of 1668137263 in words is "one billion, six hundred sixty-eight million, one hundred thirty-seven thousand, two hundred sixty-three".