63681027309 has 16 divisors (see below), whose sum is σ = 94396335040. Its totient is φ = 42429685680.

The previous prime is 63681027299. The next prime is 63681027331. The reversal of 63681027309 is 90372018636.

63681027309 is a `hidden beast` number, since 6 + 368 + 10 + 273 + 0 + 9 = 666.

It is not a de Polignac number, because 63681027309 - 2¹⁹ = 63680503021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63681029309) 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, 627862 + ... + 722199.

It is an arithmetic number, because the mean of its divisors is an integer number (5899770940).

Almost surely, 2^63681027309 is an apocalyptic number.

It is an amenable number.

63681027309 is a deficient number, since it is larger than the sum of its proper divisors (30715307731).

63681027309 is a wasteful number, since it uses less digits than its factorization.

63681027309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351817 (or 1351811 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 63681027309 in words is "sixty-three billion, six hundred eighty-one million, twenty-seven thousand, three hundred nine".