11154978768649 has 9 divisors (see below), whose sum is σ = 11194162335943. Its totient is φ = 11115931915912.

The previous prime is 11154978768641. The next prime is 11154978768683. The reversal of 11154978768649 is 94686787945111.

The square root of 11154978768649 is 3339907.

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

It can be written as a sum of positive squares in only one way, i.e., 10554149151225 + 600829617424 = 3248715^2 + 775132^2 .

It is not a de Polignac number, because 11154978768649 - 2³ = 11154978768641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11154978768641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 978587052 + ... + 978598450.

Almost surely, 2^{11154978768649} is an apocalyptic number.

11154978768649 is the 3339907-th square number.

11154978768649 is the 1669954-th centered octagonal number.

It is an amenable number.

11154978768649 is a deficient number, since it is larger than the sum of its proper divisors (39183567294).

11154978768649 is an frugal number, since it uses more digits than its factorization.

11154978768649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23384 (or 11692 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 76.

The spelling of 11154978768649 in words is "eleven trillion, one hundred fifty-four billion, nine hundred seventy-eight million, seven hundred sixty-eight thousand, six hundred forty-nine".