66010071 has 4 divisors (see below), whose sum is σ = 88013432. Its totient is φ = 44006712.

The previous prime is 66010057. The next prime is 66010079. The reversal of 66010071 is 17001066.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66010071 - 2⁵ = 66010039 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 (66010079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11001676 + ... + 11001681.

It is an arithmetic number, because the mean of its divisors is an integer number (22003358).

Almost surely, 2^66010071 is an apocalyptic number.

66010071 is a deficient number, since it is larger than the sum of its proper divisors (22003361).

66010071 is a wasteful number, since it uses less digits than its factorization.

66010071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22003360.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 66010071 is about 8124.6582081956. The cubic root of 66010071 is about 404.1445562331.

It can be divided in two parts, 660 and 10071, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 66010071 in words is "sixty-six million, ten thousand, seventy-one".