66511742 has 16 divisors (see below), whose sum is σ = 114566400. Its totient is φ = 28641240.

The previous prime is 66511729. The next prime is 66511751. The reversal of 66511742 is 24711566.

It is a junction number, because it is equal to n+sod(n) for n = 66511699 and 66511708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79142 + ... + 79977.

It is an arithmetic number, because the mean of its divisors is an integer number (7160400).

Almost surely, 2^66511742 is an apocalyptic number.

66511742 is a deficient number, since it is larger than the sum of its proper divisors (48054658).

66511742 is a wasteful number, since it uses less digits than its factorization.

66511742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159151.

The product of its digits is 10080, while the sum is 32.

The square root of 66511742 is about 8155.4731315847. The cubic root of 66511742 is about 405.1657950465.

The spelling of 66511742 in words is "sixty-six million, five hundred eleven thousand, seven hundred forty-two".