642333778813 has 8 divisors (see below), whose sum is σ = 644007218400. Its totient is φ = 640662391248.

The previous prime is 642333778799. The next prime is 642333778817. The reversal of 642333778813 is 318877333246.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642333778813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642333778817) 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, 114858 + ... + 1139236.

It is an arithmetic number, because the mean of its divisors is an integer number (80500902300).

Almost surely, 2^642333778813 is an apocalyptic number.

It is an amenable number.

642333778813 is a deficient number, since it is larger than the sum of its proper divisors (1673439587).

642333778813 is a wasteful number, since it uses less digits than its factorization.

642333778813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026011.

The product of its digits is 12192768, while the sum is 55.

The spelling of 642333778813 in words is "six hundred forty-two billion, three hundred thirty-three million, seven hundred seventy-eight thousand, eight hundred thirteen".