1605918864378 has 16 divisors (see below), whose sum is σ = 3211903144800. Its totient is φ = 535295385456.

The previous prime is 1605918864371. The next prime is 1605918864379. The reversal of 1605918864378 is 8734688195061.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1605918864371) 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, 2403600 + ... + 2998187.

It is an arithmetic number, because the mean of its divisors is an integer number (200743946550).

Almost surely, 2^{1605918864378} is an apocalyptic number.

1605918864378 is an abundant number, since it is smaller than the sum of its proper divisors (1605984280422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605918864378 is a wasteful number, since it uses less digits than its factorization.

1605918864378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451341.

The product of its (nonzero) digits is 69672960, while the sum is 66.

The spelling of 1605918864378 in words is "one trillion, six hundred five billion, nine hundred eighteen million, eight hundred sixty-four thousand, three hundred seventy-eight".