385457661636 has 12 divisors (see below), whose sum is σ = 899401210512. Its totient is φ = 128485887208.

The previous prime is 385457661629. The next prime is 385457661647. The reversal of 385457661636 is 636166754583.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 385457661636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16060735890 + ... + 16060735913.

It is an arithmetic number, because the mean of its divisors is an integer number (74950100876).

Almost surely, 2^385457661636 is an apocalyptic number.

It is an amenable number.

385457661636 is an abundant number, since it is smaller than the sum of its proper divisors (513943548876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

385457661636 is a wasteful number, since it uses less digits than its factorization.

385457661636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32121471810 (or 32121471808 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 60.

The spelling of 385457661636 in words is "three hundred eighty-five billion, four hundred fifty-seven million, six hundred sixty-one thousand, six hundred thirty-six".