1663221497 has 8 divisors (see below), whose sum is σ = 1901121600. Its totient is φ = 1425395664.

The previous prime is 1663221463. The next prime is 1663221499. The reversal of 1663221497 is 7941223661.

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

It is not a de Polignac number, because 1663221497 - 2¹⁴ = 1663205113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1663221499) 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, 43079 + ... + 71987.

It is an arithmetic number, because the mean of its divisors is an integer number (237640200).

Almost surely, 2^1663221497 is an apocalyptic number.

It is an amenable number.

1663221497 is a deficient number, since it is larger than the sum of its proper divisors (237900103).

1663221497 is an equidigital number, since it uses as much as digits as its factorization.

1663221497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37135.

The product of its digits is 108864, while the sum is 41.

The square root of 1663221497 is about 40782.6126799154. The cubic root of 1663221497 is about 1184.8135978886.

The spelling of 1663221497 in words is "one billion, six hundred sixty-three million, two hundred twenty-one thousand, four hundred ninety-seven".