63647635640666 has 64 divisors (see below), whose sum is σ = 126318159728640. Its totient is φ = 23285922543360.

The previous prime is 63647635640653. The next prime is 63647635640711. The reversal of 63647635640666 is 66604653674636.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 63647635640596 and 63647635640605.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26540390 + ... + 28838993.

It is an arithmetic number, because the mean of its divisors is an integer number (1973721245760).

Almost surely, 2^{63647635640666} is an apocalyptic number.

63647635640666 is a deficient number, since it is larger than the sum of its proper divisors (62670524087974).

63647635640666 is a wasteful number, since it uses less digits than its factorization.

63647635640666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55379859.

The product of its (nonzero) digits is 1410877440, while the sum is 68.

The spelling of 63647635640666 in words is "sixty-three trillion, six hundred forty-seven billion, six hundred thirty-five million, six hundred forty thousand, six hundred sixty-six".