66072471 has 4 divisors (see below), whose sum is σ = 88096632. Its totient is φ = 44048312.

The previous prime is 66072463. The next prime is 66072473. The reversal of 66072471 is 17427066.

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

It is a cyclic number.

It is not a de Polignac number, because 66072471 - 2³ = 66072463 is a prime.

It is a super-3 number, since 3×66072471³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66072473) 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, 11012076 + ... + 11012081.

It is an arithmetic number, because the mean of its divisors is an integer number (22024158).

Almost surely, 2^66072471 is an apocalyptic number.

66072471 is a deficient number, since it is larger than the sum of its proper divisors (22024161).

66072471 is a wasteful number, since it uses less digits than its factorization.

66072471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22024160.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 66072471 is about 8128.4974626311. The cubic root of 66072471 is about 404.2718634637.

The spelling of 66072471 in words is "sixty-six million, seventy-two thousand, four hundred seventy-one".