663661012 has 24 divisors (see below), whose sum is σ = 1328237120. Its totient is φ = 284230080.

The previous prime is 663660967. The next prime is 663661057. The reversal of 663661012 is 210166366.

It is an interprime number because it is at equal distance from previous prime (663660967) and next prime (663661057).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37687 + ... + 52417.

Almost surely, 2^663661012 is an apocalyptic number.

It is an amenable number.

663661012 is an abundant number, since it is smaller than the sum of its proper divisors (664576108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663661012 is a wasteful number, since it uses less digits than its factorization.

663661012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16351 (or 16349 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 663661012 is about 25761.6189708644. The cubic root of 663661012 is about 872.2656462067.

The spelling of 663661012 in words is "six hundred sixty-three million, six hundred sixty-one thousand, twelve".