66071841 has 16 divisors (see below), whose sum is σ = 97099968. Its totient is φ = 39628800.

The previous prime is 66071833. The next prime is 66071851. The reversal of 66071841 is 14817066.

It is a happy number.

It is not a de Polignac number, because 66071841 - 2³ = 66071833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (66071821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7120 + ... + 13521.

It is an arithmetic number, because the mean of its divisors is an integer number (6068748).

Almost surely, 2^66071841 is an apocalyptic number.

It is an amenable number.

66071841 is a deficient number, since it is larger than the sum of its proper divisors (31028127).

66071841 is a wasteful number, since it uses less digits than its factorization.

66071841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20752.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 66071841 is about 8128.4587099892. The cubic root of 66071841 is about 404.2705785510.

It can be divided in two parts, 6607 and 1841, that added together give a palindrome (8448).

The spelling of 66071841 in words is "sixty-six million, seventy-one thousand, eight hundred forty-one".