1916778161790 has 32 divisors (see below), whose sum is σ = 5111408432160. Its totient is φ = 511140843072.

The previous prime is 1916778161759. The next prime is 1916778161821. The reversal of 1916778161790 is 971618776191.

1916778161790 is a `hidden beast` number, since 1 + 9 + 1 + 6 + 7 + 7 + 8 + 1 + 617 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1916778161759) and next prime (1916778161821).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3549588919 + ... + 3549589458.

It is an arithmetic number, because the mean of its divisors is an integer number (159731513505).

Almost surely, 2^{1916778161790} is an apocalyptic number.

1916778161790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1916778161790 is an abundant number, since it is smaller than the sum of its proper divisors (3194630270370).

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

1916778161790 is a wasteful number, since it uses less digits than its factorization.

1916778161790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7099178393 (or 7099178387 counting only the distinct ones).

The product of its (nonzero) digits is 8001504, while the sum is 63.

The spelling of 1916778161790 in words is "one trillion, nine hundred sixteen billion, seven hundred seventy-eight million, one hundred sixty-one thousand, seven hundred ninety".