63508780666 has 16 divisors (see below), whose sum is σ = 98561773440. Its totient is φ = 30655159920.

The previous prime is 63508780663. The next prime is 63508780679. The reversal of 63508780666 is 66608780536.

It is not an unprimeable number, because it can be changed into a prime (63508780661) 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, 368155 + ... + 512401.

It is an arithmetic number, because the mean of its divisors is an integer number (6160110840).

Almost surely, 2^63508780666 is an apocalyptic number.

63508780666 is a deficient number, since it is larger than the sum of its proper divisors (35052992774).

63508780666 is a wasteful number, since it uses less digits than its factorization.

63508780666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151869.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 63508780666 in words is "sixty-three billion, five hundred eight million, seven hundred eighty thousand, six hundred sixty-six".