1660785995 has 16 divisors (see below), whose sum is σ = 2175694560. Its totient is φ = 1206969600.

The previous prime is 1660785983. The next prime is 1660786003. The reversal of 1660785995 is 5995870661.

It is not a de Polignac number, because 1660785995 - 2⁸ = 1660785739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1660785995.

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, 71261 + ... + 91649.

It is an arithmetic number, because the mean of its divisors is an integer number (135980910).

Almost surely, 2^1660785995 is an apocalyptic number.

1660785995 is a deficient number, since it is larger than the sum of its proper divisors (514908565).

1660785995 is a wasteful number, since it uses less digits than its factorization.

1660785995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21886.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 1660785995 is about 40752.7421776744. The cubic root of 1660785995 is about 1184.2349967551.

The spelling of 1660785995 in words is "one billion, six hundred sixty million, seven hundred eighty-five thousand, nine hundred ninety-five".