42206644817842 has 4 divisors (see below), whose sum is σ = 63309967226766. Its totient is φ = 21103322408920.

The previous prime is 42206644817801. The next prime is 42206644817861. The reversal of 42206644817842 is 24871844660224.

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 only one way, i.e., 30984352516881 + 11222292300961 = 5566359^2 + 3349969^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551661204459 + ... + 10551661204462.

Almost surely, 2^{42206644817842} is an apocalyptic number.

42206644817842 is a deficient number, since it is larger than the sum of its proper divisors (21103322408924).

42206644817842 is a wasteful number, since it uses less digits than its factorization.

42206644817842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21103322408923.

The product of its (nonzero) digits is 33030144, while the sum is 58.

The spelling of 42206644817842 in words is "forty-two trillion, two hundred six billion, six hundred forty-four million, eight hundred seventeen thousand, eight hundred forty-two".