642492683771 has 8 divisors (see below), whose sum is σ = 676350880320. Its totient is φ = 608638766472.

The previous prime is 642492683737. The next prime is 642492683839. The reversal of 642492683771 is 177386294246.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-642492683771 is a prime.

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 642492683771.

It is not an unprimeable number, because it can be changed into a prime (642492683731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759305 + ... + 1364378.

It is an arithmetic number, because the mean of its divisors is an integer number (84543860040).

Almost surely, 2^642492683771 is an apocalyptic number.

642492683771 is a deficient number, since it is larger than the sum of its proper divisors (33858196549).

642492683771 is a wasteful number, since it uses less digits than its factorization.

642492683771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139625.

The product of its digits is 24385536, while the sum is 59.

The spelling of 642492683771 in words is "six hundred forty-two billion, four hundred ninety-two million, six hundred eighty-three thousand, seven hundred seventy-one".