667706771 has 8 divisors (see below), whose sum is σ = 686072688. Its totient is φ = 649440000.

The previous prime is 667706761. The next prime is 667706779. The reversal of 667706771 is 177607766.

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

It is not a de Polignac number, because 667706771 - 2²² = 663512467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667706779) 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, 11030 + ... + 38171.

It is an arithmetic number, because the mean of its divisors is an integer number (85759086).

Almost surely, 2^667706771 is an apocalyptic number.

667706771 is a deficient number, since it is larger than the sum of its proper divisors (18365917).

667706771 is a wasteful number, since it uses less digits than its factorization.

667706771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49573.

The product of its (nonzero) digits is 518616, while the sum is 47.

The square root of 667706771 is about 25840.0226586588. The cubic root of 667706771 is about 874.0345360908.

The spelling of 667706771 in words is "six hundred sixty-seven million, seven hundred six thousand, seven hundred seventy-one".