642105335323663 has 4 divisors (see below), whose sum is σ = 642133781070568. Its totient is φ = 642076889576760.

The previous prime is 642105335323657. The next prime is 642105335323693. The reversal of 642105335323663 is 366323533501246.

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

It is a cyclic number.

It is not a de Polignac number, because 642105335323663 - 2⁵ = 642105335323631 is a prime.

It is a super-2 number, since 2×642105335323663² (a number of 30 digits) contains 22 as substring.

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 642105335323663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642105335323693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14222839593 + ... + 14222884738.

It is an arithmetic number, because the mean of its divisors is an integer number (160533445267642).

Almost surely, 2^{642105335323663} is an apocalyptic number.

642105335323663 is a deficient number, since it is larger than the sum of its proper divisors (28445746905).

642105335323663 is a wasteful number, since it uses less digits than its factorization.

642105335323663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28445746904.

The product of its (nonzero) digits is 20995200, while the sum is 52.

The spelling of 642105335323663 in words is "six hundred forty-two trillion, one hundred five billion, three hundred thirty-five million, three hundred twenty-three thousand, six hundred sixty-three".