667071081 has 12 divisors (see below), whose sum is σ = 963788800. Its totient is φ = 444602520.

The previous prime is 667070983. The next prime is 667071101. The reversal of 667071081 is 180170766.

It is a happy number.

667071081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667071081 - 2¹¹ = 667069033 is a prime.

It is a super-2 number, since 2×667071081² = 889967654213017122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667071481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45720 + ... + 58518.

Almost surely, 2^667071081 is an apocalyptic number.

It is an amenable number.

667071081 is a deficient number, since it is larger than the sum of its proper divisors (296717719).

667071081 is a wasteful number, since it uses less digits than its factorization.

667071081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18596 (or 18593 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 667071081 is about 25827.7192372846. The cubic root of 667071081 is about 873.7570732602.

The spelling of 667071081 in words is "six hundred sixty-seven million, seventy-one thousand, eighty-one".