396663561 has 80 divisors (see below), whose sum is σ = 704487168. Its totient is φ = 217728000.

The previous prime is 396663539. The next prime is 396663571. The reversal of 396663561 is 165366693.

It is not a de Polignac number, because 396663561 - 2¹⁹ = 396139273 is a prime.

Its product of digits (524880) is a multiple of the sum of its prime factors (324).

It is not an unprimeable number, because it can be changed into a prime (396663511) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2626836 + ... + 2626986.

Almost surely, 2^396663561 is an apocalyptic number.

It is an amenable number.

396663561 is a deficient number, since it is larger than the sum of its proper divisors (307823607).

396663561 is a wasteful number, since it uses less digits than its factorization.

396663561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 315 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 396663561 is about 19916.4143610239. The cubic root of 396663561 is about 734.7519862921.

The spelling of 396663561 in words is "three hundred ninety-six million, six hundred sixty-three thousand, five hundred sixty-one".