1225844364638 has 16 divisors (see below), whose sum is σ = 1888492950960. Its totient is φ = 596347240896.

The previous prime is 1225844364581. The next prime is 1225844364713. The reversal of 1225844364638 is 8364634485221.

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 7 ways as a sum of consecutive naturals, for example, 7620770 + ... + 7779962.

It is an arithmetic number, because the mean of its divisors is an integer number (118030809435).

Almost surely, 2^{1225844364638} is an apocalyptic number.

1225844364638 is a deficient number, since it is larger than the sum of its proper divisors (662648586322).

1225844364638 is a wasteful number, since it uses less digits than its factorization.

1225844364638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263291.

The product of its digits is 26542080, while the sum is 56.

The spelling of 1225844364638 in words is "one trillion, two hundred twenty-five billion, eight hundred forty-four million, three hundred sixty-four thousand, six hundred thirty-eight".