919866378417 has 24 divisors (see below), whose sum is σ = 1427770973376. Its totient is φ = 525254976288.

The previous prime is 919866378397. The next prime is 919866378419. The reversal of 919866378417 is 714873668919.

It is a happy number.

It is not a de Polignac number, because 919866378417 - 2⁷ = 919866378289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (919866378419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2076973 + ... + 2480634.

It is an arithmetic number, because the mean of its divisors is an integer number (59490457224).

Almost surely, 2^919866378417 is an apocalyptic number.

It is an amenable number.

919866378417 is a deficient number, since it is larger than the sum of its proper divisors (507904594959).

919866378417 is a wasteful number, since it uses less digits than its factorization.

919866378417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558997 (or 4558990 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 69.

The spelling of 919866378417 in words is "nine hundred nineteen billion, eight hundred sixty-six million, three hundred seventy-eight thousand, four hundred seventeen".