1663149187 has 4 divisors (see below), whose sum is σ = 1900741936. Its totient is φ = 1425556440.

The previous prime is 1663149181. The next prime is 1663149197. The reversal of 1663149187 is 7819413661.

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

It is not a de Polignac number, because 1663149187 - 2²³ = 1654760579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663149181) 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, 118796364 + ... + 118796377.

It is an arithmetic number, because the mean of its divisors is an integer number (475185484).

Almost surely, 2^1663149187 is an apocalyptic number.

1663149187 is a deficient number, since it is larger than the sum of its proper divisors (237592749).

1663149187 is an equidigital number, since it uses as much as digits as its factorization.

1663149187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237592748.

The product of its digits is 217728, while the sum is 46.

The square root of 1663149187 is about 40781.7261405154. The cubic root of 1663149187 is about 1184.7964273728.

The spelling of 1663149187 in words is "one billion, six hundred sixty-three million, one hundred forty-nine thousand, one hundred eighty-seven".