1663097521 has 8 divisors (see below), whose sum is σ = 1683887400. Its totient is φ = 1642354560.

The previous prime is 1663097483. The next prime is 1663097533. The reversal of 1663097521 is 1257903661.

It can be written as a sum of positive squares in 4 ways, for example, as 279257521 + 1383840000 = 16711^2 + 37200^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1663097521 - 2¹⁹ = 1662573233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663097551) 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, 62511 + ... + 85051.

It is an arithmetic number, because the mean of its divisors is an integer number (210485925).

Almost surely, 2^1663097521 is an apocalyptic number.

It is an amenable number.

1663097521 is a deficient number, since it is larger than the sum of its proper divisors (20789879).

1663097521 is an equidigital number, since it uses as much as digits as its factorization.

1663097521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23459.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1663097521 is about 40781.0926901181. The cubic root of 1663097521 is about 1184.7841586145.

The spelling of 1663097521 in words is "one billion, six hundred sixty-three million, ninety-seven thousand, five hundred twenty-one".