11721078355 has 16 divisors (see below), whose sum is σ = 16347075840. Its totient is φ = 7901083872.

The previous prime is 11721078311. The next prime is 11721078367. The reversal of 11721078355 is 55387012711.

It is a cyclic number.

It is not a de Polignac number, because 11721078355 - 2⁹ = 11721077843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2835969 + ... + 2840098.

It is an arithmetic number, because the mean of its divisors is an integer number (1021692240).

Almost surely, 2^11721078355 is an apocalyptic number.

11721078355 is a deficient number, since it is larger than the sum of its proper divisors (4625997485).

11721078355 is an equidigital number, since it uses as much as digits as its factorization.

11721078355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676138.

The product of its (nonzero) digits is 58800, while the sum is 40.

The spelling of 11721078355 in words is "eleven billion, seven hundred twenty-one million, seventy-eight thousand, three hundred fifty-five".