642715195 has 8 divisors (see below), whose sum is σ = 789194736. Its totient is φ = 502214496.

The previous prime is 642715193. The next prime is 642715207. The reversal of 642715195 is 591517246.

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

It is a cyclic number.

It is not a de Polignac number, because 642715195 - 2¹ = 642715193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642715193) 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, 1494472 + ... + 1494901.

It is an arithmetic number, because the mean of its divisors is an integer number (98649342).

Almost surely, 2^642715195 is an apocalyptic number.

642715195 is a deficient number, since it is larger than the sum of its proper divisors (146479541).

642715195 is a wasteful number, since it uses less digits than its factorization.

642715195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2989421.

The product of its digits is 75600, while the sum is 40.

The square root of 642715195 is about 25351.8282378214. The cubic root of 642715195 is about 862.9908462817.

It can be divided in two parts, 6427151 and 95, that added together give a palindrome (6427246).

The spelling of 642715195 in words is "six hundred forty-two million, seven hundred fifteen thousand, one hundred ninety-five".