1663551287 has 2 divisors, whose sum is σ = 1663551288. Its totient is φ = 1663551286.

The previous prime is 1663551223. The next prime is 1663551293. The reversal of 1663551287 is 7821553661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1663551287 - 2⁶ = 1663551223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663551587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831775643 + 831775644.

It is an arithmetic number, because the mean of its divisors is an integer number (831775644).

Almost surely, 2^1663551287 is an apocalyptic number.

1663551287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663551287 is an equidigital number, since it uses as much as digits as its factorization.

1663551287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 44.

The square root of 1663551287 is about 40786.6557467023. The cubic root of 1663551287 is about 1184.8919025229.

The spelling of 1663551287 in words is "one billion, six hundred sixty-three million, five hundred fifty-one thousand, two hundred eighty-seven".