663400696634 has 16 divisors (see below), whose sum is σ = 1073504577768. Its totient is φ = 305654280192.

The previous prime is 663400696631. The next prime is 663400696687. The reversal of 663400696634 is 436696004366.

It can be written as a sum of positive squares in 4 ways, for example, as 642397441009 + 21003255625 = 801497^2 + 144925^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (663400696631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22095407 + ... + 22125410.

Almost surely, 2^663400696634 is an apocalyptic number.

663400696634 is a deficient number, since it is larger than the sum of its proper divisors (410103881134).

663400696634 is a wasteful number, since it uses less digits than its factorization.

663400696634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44221409.

The product of its (nonzero) digits is 10077696, while the sum is 53.

The spelling of 663400696634 in words is "six hundred sixty-three billion, four hundred million, six hundred ninety-six thousand, six hundred thirty-four".