663499848025 has 135 divisors (see below), whose sum is σ = 1044915179649. Its totient is φ = 416635107840.

The previous prime is 663499847981. The next prime is 663499848031. The reversal of 663499848025 is 520848994366.

The square root of 663499848025 is 814555.

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

It can be written as a sum of positive squares in 22 ways, for example, as 156459011401 + 507040836624 = 395549^2 + 712068^2 .

It is not a de Polignac number, because 663499848025 - 2⁷ = 663499847897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 17932428307 + ... + 17932428343.

Almost surely, 2^663499848025 is an apocalyptic number.

663499848025 is the 814555-th square number.

663499848025 is the 407278-th centered octagonal number.

It is an amenable number.

663499848025 is a deficient number, since it is larger than the sum of its proper divisors (381415331624).

663499848025 is an frugal number, since it uses more digits than its factorization.

663499848025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 64.

Multiplying 663499848025 by its sum of digits (64), we get a square (42463990273600 = 6516440²).

The spelling of 663499848025 in words is "six hundred sixty-three billion, four hundred ninety-nine million, eight hundred forty-eight thousand, twenty-five".