11640697778 has 16 divisors (see below), whose sum is σ = 17936795520. Its totient is φ = 5662557600.

The previous prime is 11640697777. The next prime is 11640697801. The reversal of 11640697778 is 87779604611.

It is not an unprimeable number, because it can be changed into a prime (11640697777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168278 + ... + 227153.

It is an arithmetic number, because the mean of its divisors is an integer number (1121049720).

Almost surely, 2^11640697778 is an apocalyptic number.

11640697778 is a deficient number, since it is larger than the sum of its proper divisors (6296097742).

11640697778 is a wasteful number, since it uses less digits than its factorization.

11640697778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395833.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 11640697778 in words is "eleven billion, six hundred forty million, six hundred ninety-seven thousand, seven hundred seventy-eight".