1078578801666 has 24 divisors (see below), whose sum is σ = 2342807202684. Its totient is φ = 358620657120.

The previous prime is 1078578801647. The next prime is 1078578801667. The reversal of 1078578801666 is 6661088758701.

It can be written as a sum of positive squares in 2 ways, for example, as 1005248869641 + 73329932025 = 1002621^2 + 270795^2 .

It is a super-3 number, since 3×1078578801666³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1078578801667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75460165 + ... + 75474456.

Almost surely, 2^{1078578801666} is an apocalyptic number.

1078578801666 is an abundant number, since it is smaller than the sum of its proper divisors (1264228401018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1078578801666 is a wasteful number, since it uses less digits than its factorization.

1078578801666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150935026 (or 150935023 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 63.

The spelling of 1078578801666 in words is "one trillion, seventy-eight billion, five hundred seventy-eight million, eight hundred one thousand, six hundred sixty-six".