663561465 has 16 divisors (see below), whose sum is σ = 1213369728. Its totient is φ = 303342336.

The previous prime is 663561461. The next prime is 663561467. The reversal of 663561465 is 564165366.

It is not a de Polignac number, because 663561465 - 2² = 663561461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663561461) 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, 3159712 + ... + 3159921.

It is an arithmetic number, because the mean of its divisors is an integer number (75835608).

Almost surely, 2^663561465 is an apocalyptic number.

It is an amenable number.

663561465 is a deficient number, since it is larger than the sum of its proper divisors (549808263).

663561465 is a wasteful number, since it uses less digits than its factorization.

663561465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319648.

The product of its digits is 388800, while the sum is 42.

The square root of 663561465 is about 25759.6868187484. The cubic root of 663561465 is about 872.2220316863. Note that the first 3 decimals are identical.

The spelling of 663561465 in words is "six hundred sixty-three million, five hundred sixty-one thousand, four hundred sixty-five".