2478663997 has 4 divisors (see below), whose sum is σ = 2502728800. Its totient is φ = 2454599196.

The previous prime is 2478663991. The next prime is 2478664037. The reversal of 2478663997 is 7993668742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2478663997 is a prime.

It is a super-2 number, since 2×2478663997² = 12287550420048032018, 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 (2478663991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12032247 + ... + 12032452.

It is an arithmetic number, because the mean of its divisors is an integer number (625682200).

Almost surely, 2^2478663997 is an apocalyptic number.

It is an amenable number.

2478663997 is a deficient number, since it is larger than the sum of its proper divisors (24064803).

2478663997 is a wasteful number, since it uses less digits than its factorization.

2478663997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24064802.

The product of its digits is 27433728, while the sum is 61.

The square root of 2478663997 is about 49786.1827920157. The cubic root of 2478663997 is about 1353.3367840203.

The spelling of 2478663997 in words is "two billion, four hundred seventy-eight million, six hundred sixty-three thousand, nine hundred ninety-seven".