1663765255 has 8 divisors (see below), whose sum is σ = 1998053712. Its totient is φ = 1329988608.

The previous prime is 1663765253. The next prime is 1663765277. The reversal of 1663765255 is 5525673661.

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 1663765255 - 2¹ = 1663765253 is a prime.

It is a super-2 number, since 2×1663765255² = 5536229647490430050, 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 (1663765253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120762 + ... + 133831.

It is an arithmetic number, because the mean of its divisors is an integer number (249756714).

Almost surely, 2^1663765255 is an apocalyptic number.

1663765255 is a deficient number, since it is larger than the sum of its proper divisors (334288457).

1663765255 is a wasteful number, since it uses less digits than its factorization.

1663765255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255905.

The product of its digits is 1134000, while the sum is 46.

The square root of 1663765255 is about 40789.2786771230. The cubic root of 1663765255 is about 1184.9427010934.

The spelling of 1663765255 in words is "one billion, six hundred sixty-three million, seven hundred sixty-five thousand, two hundred fifty-five".