1663674979 has 16 divisors (see below), whose sum is σ = 1794672000. Its totient is φ = 1537436160.

The previous prime is 1663674959. The next prime is 1663674997. The reversal of 1663674979 is 9794763661.

It is not a de Polignac number, because 1663674979 - 2²⁹ = 1126804067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663674959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141187 + ... + 152515.

It is an arithmetic number, because the mean of its divisors is an integer number (112167000).

Almost surely, 2^1663674979 is an apocalyptic number.

1663674979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1663674979 is a deficient number, since it is larger than the sum of its proper divisors (130997021).

1663674979 is a wasteful number, since it uses less digits than its factorization.

1663674979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11538.

The product of its digits is 10287648, while the sum is 58.

The square root of 1663674979 is about 40788.1720477886. The cubic root of 1663674979 is about 1184.9212690190.

The spelling of 1663674979 in words is "one billion, six hundred sixty-three million, six hundred seventy-four thousand, nine hundred seventy-nine".