1089740864978 has 4 divisors (see below), whose sum is σ = 1634611297470. Its totient is φ = 544870432488.

The previous prime is 1089740864963. The next prime is 1089740864981. The reversal of 1089740864978 is 8794680479801.

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., 1089720946609 + 19918369 = 1043897^2 + 4463^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272435216243 + ... + 272435216246.

Almost surely, 2^{1089740864978} is an apocalyptic number.

1089740864978 is a deficient number, since it is larger than the sum of its proper divisors (544870432492).

1089740864978 is an equidigital number, since it uses as much as digits as its factorization.

1089740864978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544870432491.

The product of its (nonzero) digits is 195084288, while the sum is 71.

The spelling of 1089740864978 in words is "one trillion, eighty-nine billion, seven hundred forty million, eight hundred sixty-four thousand, nine hundred seventy-eight".