1663850497 has 4 divisors (see below), whose sum is σ = 1666323460. Its totient is φ = 1661377536.

The previous prime is 1663850459. The next prime is 1663850527. The reversal of 1663850497 is 7940583661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1025984961 + 637865536 = 32031^2 + 25256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663850497 - 2¹⁹ = 1663326209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663850497.

It is not an unprimeable number, because it can be changed into a prime (1663850407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235472 + ... + 1236817.

It is an arithmetic number, because the mean of its divisors is an integer number (416580865).

Almost surely, 2^1663850497 is an apocalyptic number.

It is an amenable number.

1663850497 is a deficient number, since it is larger than the sum of its proper divisors (2472963).

1663850497 is an equidigital number, since it uses as much as digits as its factorization.

1663850497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472962.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 1663850497 is about 40790.3235706705. The cubic root of 1663850497 is about 1184.9629373538.

The spelling of 1663850497 in words is "one billion, six hundred sixty-three million, eight hundred fifty thousand, four hundred ninety-seven".