1438895394661 has 4 divisors (see below), whose sum is σ = 1439250593824. Its totient is φ = 1438540195500.

The previous prime is 1438895394593. The next prime is 1438895394667. The reversal of 1438895394661 is 1664935988341.

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 a cyclic number.

It is not a de Polignac number, because 1438895394661 - 2¹³ = 1438895386469 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 (1438895394667) 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, 177593505 + ... + 177601606.

It is an arithmetic number, because the mean of its divisors is an integer number (359812648456).

Almost surely, 2^{1438895394661} is an apocalyptic number.

It is an amenable number.

1438895394661 is a deficient number, since it is larger than the sum of its proper divisors (355199163).

1438895394661 is an equidigital number, since it uses as much as digits as its factorization.

1438895394661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355199162.

The product of its digits is 134369280, while the sum is 67.

The spelling of 1438895394661 in words is "one trillion, four hundred thirty-eight billion, eight hundred ninety-five million, three hundred ninety-four thousand, six hundred sixty-one".