2119978668356 has 6 divisors (see below), whose sum is σ = 3709962669630. Its totient is φ = 1059989334176.

The previous prime is 2119978668341. The next prime is 2119978668373. The reversal of 2119978668356 is 6538668799112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2117141401600 + 2837266756 = 1455040^2 + 53266^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2119978668356.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 264997333541 + ... + 264997333548.

It is an arithmetic number, because the mean of its divisors is an integer number (618327111605).

Almost surely, 2^{2119978668356} is an apocalyptic number.

It is an amenable number.

2119978668356 is a deficient number, since it is larger than the sum of its proper divisors (1589984001274).

2119978668356 is a wasteful number, since it uses less digits than its factorization.

2119978668356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529994667093 (or 529994667091 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 71.

The spelling of 2119978668356 in words is "two trillion, one hundred nineteen billion, nine hundred seventy-eight million, six hundred sixty-eight thousand, three hundred fifty-six".