66642535 has 4 divisors (see below), whose sum is σ = 79971048. Its totient is φ = 53314024.

The previous prime is 66642509. The next prime is 66642553. The reversal of 66642535 is 53524666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66642535 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66642494 and 66642503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6664249 + ... + 6664258.

It is an arithmetic number, because the mean of its divisors is an integer number (19992762).

Almost surely, 2^66642535 is an apocalyptic number.

66642535 is a deficient number, since it is larger than the sum of its proper divisors (13328513).

66642535 is a wasteful number, since it uses less digits than its factorization.

66642535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13328512.

The product of its digits is 129600, while the sum is 37.

The square root of 66642535 is about 8163.4879187759. The cubic root of 66642535 is about 405.4312025768.

The spelling of 66642535 in words is "sixty-six million, six hundred forty-two thousand, five hundred thirty-five".