1206531663 has 8 divisors (see below), whose sum is σ = 1630746288. Its totient is φ = 793335744.

The previous prime is 1206531661. The next prime is 1206531671. The reversal of 1206531663 is 3661356021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1206531663 - 2¹ = 1206531661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206531661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2754420 + ... + 2754857.

It is an arithmetic number, because the mean of its divisors is an integer number (203843286).

Almost surely, 2^1206531663 is an apocalyptic number.

1206531663 is a deficient number, since it is larger than the sum of its proper divisors (424214625).

1206531663 is an equidigital number, since it uses as much as digits as its factorization.

1206531663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5509353.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 1206531663 is about 34735.1646462198. The cubic root of 1206531663 is about 1064.5831170502.

Adding to 1206531663 its reverse (3661356021), we get a palindrome (4867887684).

The spelling of 1206531663 in words is "one billion, two hundred six million, five hundred thirty-one thousand, six hundred sixty-three".