1242205578646 has 8 divisors (see below), whose sum is σ = 1944321775344. Its totient is φ = 594098320200.

The previous prime is 1242205578641. The next prime is 1242205578697. The reversal of 1242205578646 is 6468755022421.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1242205578593 and 1242205578602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242205578641) by changing a digit.

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, 13502234505 + ... + 13502234596.

It is an arithmetic number, because the mean of its divisors is an integer number (243040221918).

Almost surely, 2^{1242205578646} is an apocalyptic number.

1242205578646 is a deficient number, since it is larger than the sum of its proper divisors (702116196698).

1242205578646 is a wasteful number, since it uses less digits than its factorization.

1242205578646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27004469126.

The product of its (nonzero) digits is 6451200, while the sum is 52.

The spelling of 1242205578646 in words is "one trillion, two hundred forty-two billion, two hundred five million, five hundred seventy-eight thousand, six hundred forty-six".