66131643 has 8 divisors (see below), whose sum is σ = 88633168. Its totient is φ = 43858944.

The previous prime is 66131641. The next prime is 66131677. The reversal of 66131643 is 34613166.

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

It is not a de Polignac number, because 66131643 - 2¹ = 66131641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66131643.

It is not an unprimeable number, because it can be changed into a prime (66131641) 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, 56530 + ... + 57687.

It is an arithmetic number, because the mean of its divisors is an integer number (11079146).

Almost surely, 2^66131643 is an apocalyptic number.

66131643 is a deficient number, since it is larger than the sum of its proper divisors (22501525).

66131643 is a wasteful number, since it uses less digits than its factorization.

66131643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114413.

The product of its digits is 7776, while the sum is 30.

The square root of 66131643 is about 8132.1364351565. The cubic root of 66131643 is about 404.3925109730.

It can be divided in two parts, 6613 and 1643, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 66131643 in words is "sixty-six million, one hundred thirty-one thousand, six hundred forty-three".