663689051 has 2 divisors, whose sum is σ = 663689052. Its totient is φ = 663689050.

The previous prime is 663689023. The next prime is 663689111. The reversal of 663689051 is 150986366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663689051 - 2¹⁰ = 663688027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 663688993 and 663689011.

It is not a weakly prime, because it can be changed into another prime (663689251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331844525 + 331844526.

It is an arithmetic number, because the mean of its divisors is an integer number (331844526).

Almost surely, 2^663689051 is an apocalyptic number.

663689051 is a deficient number, since it is larger than the sum of its proper divisors (1).

663689051 is an equidigital number, since it uses as much as digits as its factorization.

663689051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 663689051 is about 25762.1631661629. The cubic root of 663689051 is about 872.2779301446.

The spelling of 663689051 in words is "six hundred sixty-three million, six hundred eighty-nine thousand, fifty-one".