7749442449478 has 4 divisors (see below), whose sum is σ = 11624163674220. Its totient is φ = 3874721224738.

The previous prime is 7749442449461. The next prime is 7749442449487. The reversal of 7749442449478 is 8749442449477.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7749442449478.

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 as a sum of consecutive naturals, namely, 1937360612368 + ... + 1937360612371.

It is an arithmetic number, because the mean of its divisors is an integer number (2906040918555).

Almost surely, 2^{7749442449478} is an apocalyptic number.

7749442449478 is a deficient number, since it is larger than the sum of its proper divisors (3874721224742).

7749442449478 is a wasteful number, since it uses less digits than its factorization.

7749442449478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874721224741.

The product of its digits is 1820786688, while the sum is 73.

Subtracting 7749442449478 from its reverse (8749442449477), we obtain a palindrome (999999999999).

The spelling of 7749442449478 in words is "seven trillion, seven hundred forty-nine billion, four hundred forty-two million, four hundred forty-nine thousand, four hundred seventy-eight".