642238483405 has 4 divisors (see below), whose sum is σ = 770686180092. Its totient is φ = 513790786720.

The previous prime is 642238483351. The next prime is 642238483427. The reversal of 642238483405 is 504384832246.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 162891345604 + 479347137801 = 403598^2 + 692349^2 .

It is not a de Polignac number, because 642238483405 - 2³⁷ = 504799529933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 64223848336 + ... + 64223848345.

It is an arithmetic number, because the mean of its divisors is an integer number (192671545023).

Almost surely, 2^642238483405 is an apocalyptic number.

It is an amenable number.

642238483405 is a deficient number, since it is larger than the sum of its proper divisors (128447696687).

642238483405 is a wasteful number, since it uses less digits than its factorization.

642238483405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128447696686.

The product of its (nonzero) digits is 4423680, while the sum is 49.

The spelling of 642238483405 in words is "six hundred forty-two billion, two hundred thirty-eight million, four hundred eighty-three thousand, four hundred five".