663398451 has 8 divisors (see below), whose sum is σ = 982812560. Its totient is φ = 442265616.

The previous prime is 663398443. The next prime is 663398473. The reversal of 663398451 is 154893366.

663398451 is a `hidden beast` number, since 6 + 633 + 9 + 8 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 663398451 - 2³ = 663398443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663398397 and 663398406.

It is not an unprimeable number, because it can be changed into a prime (663398431) 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, 12285130 + ... + 12285183.

It is an arithmetic number, because the mean of its divisors is an integer number (122851570).

Almost surely, 2^663398451 is an apocalyptic number.

663398451 is a deficient number, since it is larger than the sum of its proper divisors (319414109).

663398451 is a wasteful number, since it uses less digits than its factorization.

663398451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24570322 (or 24570316 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 663398451 is about 25756.5224943120. The cubic root of 663398451 is about 872.1506009525.

The spelling of 663398451 in words is "six hundred sixty-three million, three hundred ninety-eight thousand, four hundred fifty-one".