642538452837 has 4 divisors (see below), whose sum is σ = 856717937120. Its totient is φ = 428358968556.

The previous prime is 642538452781. The next prime is 642538452839. The reversal of 642538452837 is 738254835246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642538452837 - 2⁷ = 642538452709 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 (642538452839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107089742137 + ... + 107089742142.

It is an arithmetic number, because the mean of its divisors is an integer number (214179484280).

Almost surely, 2^642538452837 is an apocalyptic number.

It is an amenable number.

642538452837 is a deficient number, since it is larger than the sum of its proper divisors (214179484283).

642538452837 is a wasteful number, since it uses less digits than its factorization.

642538452837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214179484282.

The product of its digits is 38707200, while the sum is 57.

The spelling of 642538452837 in words is "six hundred forty-two billion, five hundred thirty-eight million, four hundred fifty-two thousand, eight hundred thirty-seven".