1663537607524 has 81 divisors (see below), whose sum is σ = 3187759741803. Its totient is φ = 759258549504.

The previous prime is 1663537607489. The next prime is 1663537607531. The reversal of 1663537607524 is 4257067353661.

The square root of 1663537607524 is 1289782.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1241401529124 + 422136078400 = 1114182^2 + 649720^2 .

It is a super-2 number, since 2×1663537607524² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3789379297 + ... + 3789379735.

Almost surely, 2^{1663537607524} is an apocalyptic number.

1663537607524 is the 1289782-nd square number.

It is an amenable number.

1663537607524 is a deficient number, since it is larger than the sum of its proper divisors (1524222134279).

1663537607524 is an equidigital number, since it uses as much as digits as its factorization.

1663537607524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 55.

The spelling of 1663537607524 in words is "one trillion, six hundred sixty-three billion, five hundred thirty-seven million, six hundred seven thousand, five hundred twenty-four".