1016661985 has 16 divisors (see below), whose sum is σ = 1282216320. Its totient is φ = 772358400.

The previous prime is 1016661979. The next prime is 1016661991. The reversal of 1016661985 is 5891666101.

1016661985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1016661979) and next prime (1016661991).

It is not a de Polignac number, because 1016661985 - 2⁹ = 1016661473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15816 + ... + 47785.

It is an arithmetic number, because the mean of its divisors is an integer number (80138520).

Almost surely, 2^1016661985 is an apocalyptic number.

It is an amenable number.

1016661985 is a deficient number, since it is larger than the sum of its proper divisors (265554335).

1016661985 is a wasteful number, since it uses less digits than its factorization.

1016661985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63768.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1016661985 is about 31885.1373683727. The cubic root of 1016661985 is about 1005.5234305449.

The spelling of 1016661985 in words is "one billion, sixteen million, six hundred sixty-one thousand, nine hundred eighty-five".