660670777 has 8 divisors (see below), whose sum is σ = 711791360. Its totient is φ = 609593040.

The previous prime is 660670741. The next prime is 660670781. The reversal of 660670777 is 777076066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660670777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660670177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26002 + ... + 44692.

It is an arithmetic number, because the mean of its divisors is an integer number (88973920).

Almost surely, 2^660670777 is an apocalyptic number.

It is an amenable number.

660670777 is a deficient number, since it is larger than the sum of its proper divisors (51120583).

660670777 is a wasteful number, since it uses less digits than its factorization.

660670777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21423.

The product of its (nonzero) digits is 518616, while the sum is 46.

The square root of 660670777 is about 25703.5168216336. The cubic root of 660670777 is about 870.9536277726.

The spelling of 660670777 in words is "six hundred sixty million, six hundred seventy thousand, seven hundred seventy-seven".