666985735 has 16 divisors (see below), whose sum is σ = 912655296. Its totient is φ = 463569408.

The previous prime is 666985727. The next prime is 666985799. The reversal of 666985735 is 537589666.

It is a cyclic number.

It is not a de Polignac number, because 666985735 - 2³ = 666985727 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 300699 + ... + 302908.

It is an arithmetic number, because the mean of its divisors is an integer number (57040956).

Almost surely, 2^666985735 is an apocalyptic number.

666985735 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

666985735 is a deficient number, since it is larger than the sum of its proper divisors (245669561).

666985735 is a wasteful number, since it uses less digits than its factorization.

666985735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603642.

The product of its digits is 8164800, while the sum is 55.

The square root of 666985735 is about 25826.0669673104. The cubic root of 666985735 is about 873.7198084400.

The spelling of 666985735 in words is "six hundred sixty-six million, nine hundred eighty-five thousand, seven hundred thirty-five".