1663765955 has 8 divisors (see below), whose sum is σ = 1997036304. Its totient is φ = 1330668000.

The previous prime is 1663765919. The next prime is 1663765963. The reversal of 1663765955 is 5595673661.

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

It is not a de Polignac number, because 1663765955 - 2¹⁰ = 1663764931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663765897 and 1663765906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20816 + ... + 61325.

It is an arithmetic number, because the mean of its divisors is an integer number (249629538).

Almost surely, 2^1663765955 is an apocalyptic number.

1663765955 is a deficient number, since it is larger than the sum of its proper divisors (333270349).

1663765955 is an equidigital number, since it uses as much as digits as its factorization.

1663765955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86197.

The product of its digits is 5103000, while the sum is 53.

The square root of 1663765955 is about 40789.2872578083. The cubic root of 1663765955 is about 1184.9428672746.

The spelling of 1663765955 in words is "one billion, six hundred sixty-three million, seven hundred sixty-five thousand, nine hundred fifty-five".