663421451 has 16 divisors (see below), whose sum is σ = 847300608. Its totient is φ = 504340800.

The previous prime is 663421439. The next prime is 663421463. The reversal of 663421451 is 154124366.

It is an interprime number because it is at equal distance from previous prime (663421439) and next prime (663421463).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663421451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663421351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101915 + ... + 108228.

It is an arithmetic number, because the mean of its divisors is an integer number (52956288).

Almost surely, 2^663421451 is an apocalyptic number.

663421451 is a deficient number, since it is larger than the sum of its proper divisors (183879157).

663421451 is a wasteful number, since it uses less digits than its factorization.

663421451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210202.

The product of its digits is 17280, while the sum is 32.

The square root of 663421451 is about 25756.9689792879. The cubic root of 663421451 is about 872.1606799792.

The spelling of 663421451 in words is "six hundred sixty-three million, four hundred twenty-one thousand, four hundred fifty-one".