1099878660001 has 27 divisors (see below), whose sum is σ = 1228134052593. Its totient is φ = 984273788520.

The previous prime is 1099878659993. The next prime is 1099878660011. The reversal of 1099878660001 is 1000668789901.

The square root of 1099878660001 is 1048751.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1099878660001 - 2³ = 1099878659993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1099878660011) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 772928776 + ... + 772930198.

Almost surely, 2^{1099878660001} is an apocalyptic number.

1099878660001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1099878660001 is the 1048751-st square number.

1099878660001 is the 524376-th centered octagonal number.

It is an amenable number.

1099878660001 is a deficient number, since it is larger than the sum of its proper divisors (128255392592).

1099878660001 is an frugal number, since it uses more digits than its factorization.

1099878660001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 55.

The spelling of 1099878660001 in words is "one trillion, ninety-nine billion, eight hundred seventy-eight million, six hundred sixty thousand, one".