1478911557778 has 8 divisors (see below), whose sum is σ = 2218392727740. Its totient is φ = 739447315200.

The previous prime is 1478911557709. The next prime is 1478911557793. The reversal of 1478911557778 is 8777551198741.

It can be written as a sum of positive squares in 2 ways, for example, as 1473327433249 + 5584124529 = 1213807^2 + 74727^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4011123 + ... + 4364278.

Almost surely, 2^{1478911557778} is an apocalyptic number.

1478911557778 is a deficient number, since it is larger than the sum of its proper divisors (739481169962).

1478911557778 is an equidigital number, since it uses as much as digits as its factorization.

1478911557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8463692.

The product of its digits is 138297600, while the sum is 70.

The spelling of 1478911557778 in words is "one trillion, four hundred seventy-eight billion, nine hundred eleven million, five hundred fifty-seven thousand, seven hundred seventy-eight".