1100000999978 has 4 divisors (see below), whose sum is σ = 1650001499970. Its totient is φ = 550000499988.

The previous prime is 1100000999969. The next prime is 1100001000023. The reversal of 1100000999978 is 8799990000011.

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

It can be written as a sum of positive squares in only one way, i.e., 857240812129 + 242760187849 = 925873^2 + 492707^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275000249993 + ... + 275000249996.

Almost surely, 2^{1100000999978} is an apocalyptic number.

1100000999978 is a deficient number, since it is larger than the sum of its proper divisors (550000499992).

1100000999978 is an equidigital number, since it uses as much as digits as its factorization.

1100000999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550000499991.

The product of its (nonzero) digits is 367416, while the sum is 53.

Adding to 1100000999978 its reverse (8799990000011), we get a palindrome (9899990999989).

The spelling of 1100000999978 in words is "one trillion, one hundred billion, nine hundred ninety-nine thousand, nine hundred seventy-eight".