215368380779 has 4 divisors (see below), whose sum is σ = 215513021880. Its totient is φ = 215223739680.

The previous prime is 215368380769. The next prime is 215368380823. The reversal of 215368380779 is 977083863512.

It is a happy number.

215368380779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215368380779 - 2⁸ = 215368380523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215368380769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72318317 + ... + 72321294.

It is an arithmetic number, because the mean of its divisors is an integer number (53878255470).

Almost surely, 2^215368380779 is an apocalyptic number.

215368380779 is a deficient number, since it is larger than the sum of its proper divisors (144641101).

215368380779 is a wasteful number, since it uses less digits than its factorization.

215368380779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144641100.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 215368380779 in words is "two hundred fifteen billion, three hundred sixty-eight million, three hundred eighty thousand, seven hundred seventy-nine".