2451663987 has 4 divisors (see below), whose sum is σ = 3268885320. Its totient is φ = 1634442656.

The previous prime is 2451663941. The next prime is 2451664021. The reversal of 2451663987 is 7893661542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2451663987 - 2¹⁰ = 2451662963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2451663937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408610662 + ... + 408610667.

It is an arithmetic number, because the mean of its divisors is an integer number (817221330).

Almost surely, 2^2451663987 is an apocalyptic number.

2451663987 is a deficient number, since it is larger than the sum of its proper divisors (817221333).

2451663987 is an equidigital number, since it uses as much as digits as its factorization.

2451663987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817221332.

The product of its digits is 2177280, while the sum is 51.

The square root of 2451663987 is about 49514.2806370041. The cubic root of 2451663987 is about 1348.4048808813.

The spelling of 2451663987 in words is "two billion, four hundred fifty-one million, six hundred sixty-three thousand, nine hundred eighty-seven".