666072071 has 8 divisors (see below), whose sum is σ = 762562944. Its totient is φ = 569915640.

The previous prime is 666072061. The next prime is 666072083. The reversal of 666072071 is 170270666.

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

It is not a de Polignac number, because 666072071 - 2⁶ = 666072007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666072031) 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, 79325 + ... + 87318.

It is an arithmetic number, because the mean of its divisors is an integer number (95320368).

Almost surely, 2^666072071 is an apocalyptic number.

666072071 is a deficient number, since it is larger than the sum of its proper divisors (96490873).

666072071 is a wasteful number, since it uses less digits than its factorization.

666072071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167221.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 666072071 is about 25808.3721106156. The cubic root of 666072071 is about 873.3206739063.

The spelling of 666072071 in words is "six hundred sixty-six million, seventy-two thousand, seventy-one".