660632785 has 8 divisors (see below), whose sum is σ = 818332416. Its totient is φ = 511457520.

The previous prime is 660632783. The next prime is 660632803. The reversal of 660632785 is 587236066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660632785 - 2¹ = 660632783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660632783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2130919 + ... + 2131228.

It is an arithmetic number, because the mean of its divisors is an integer number (102291552).

Almost surely, 2^660632785 is an apocalyptic number.

It is an amenable number.

660632785 is a deficient number, since it is larger than the sum of its proper divisors (157699631).

660632785 is a wasteful number, since it uses less digits than its factorization.

660632785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262183.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 660632785 is about 25702.7777681713. Note that the first 4 decimals coincide. The cubic root of 660632785 is about 870.9369326674.

The spelling of 660632785 in words is "six hundred sixty million, six hundred thirty-two thousand, seven hundred eighty-five".