642517378271 has 16 divisors (see below), whose sum is σ = 664425688320. Its totient is φ = 620683741440.

The previous prime is 642517378267. The next prime is 642517378303. The reversal of 642517378271 is 172873715246.

It is a cyclic number.

It is not a de Polignac number, because 642517378271 - 2² = 642517378267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642517378201) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 65444555 + ... + 65454371.

It is an arithmetic number, because the mean of its divisors is an integer number (41526605520).

Almost surely, 2^642517378271 is an apocalyptic number.

642517378271 is a deficient number, since it is larger than the sum of its proper divisors (21908310049).

642517378271 is a wasteful number, since it uses less digits than its factorization.

642517378271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13394.

The product of its digits is 3951360, while the sum is 53.

The spelling of 642517378271 in words is "six hundred forty-two billion, five hundred seventeen million, three hundred seventy-eight thousand, two hundred seventy-one".