1078782661 has 4 divisors (see below), whose sum is σ = 1176853824. Its totient is φ = 980711500.

The previous prime is 1078782659. The next prime is 1078782697. The reversal of 1078782661 is 1662878701.

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 1078782661 - 2¹ = 1078782659 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 (1078782641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49035565 + ... + 49035586.

It is an arithmetic number, because the mean of its divisors is an integer number (294213456).

Almost surely, 2^1078782661 is an apocalyptic number.

1078782661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1078782661 is a deficient number, since it is larger than the sum of its proper divisors (98071163).

1078782661 is an equidigital number, since it uses as much as digits as its factorization.

1078782661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98071162.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 1078782661 is about 32844.8270051769. The cubic root of 1078782661 is about 1025.5999378191.

The spelling of 1078782661 in words is "one billion, seventy-eight million, seven hundred eighty-two thousand, six hundred sixty-one".