1663240979 has 8 divisors (see below), whose sum is σ = 1687457520. Its totient is φ = 1639063296.

The previous prime is 1663240949. The next prime is 1663240993. The reversal of 1663240979 is 9790423661.

It is a happy number.

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 1663240979 - 2⁸ = 1663240723 is a prime.

It is a super-4 number, since 4×1663240979⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663240949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82859 + ... + 100955.

It is an arithmetic number, because the mean of its divisors is an integer number (210932190).

Almost surely, 2^1663240979 is an apocalyptic number.

1663240979 is a deficient number, since it is larger than the sum of its proper divisors (24216541).

1663240979 is a wasteful number, since it uses less digits than its factorization.

1663240979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19429.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 1663240979 is about 40782.8515310050. The cubic root of 1663240979 is about 1184.8182239408.

The spelling of 1663240979 in words is "one billion, six hundred sixty-three million, two hundred forty thousand, nine hundred seventy-nine".