1917788045680 has 80 divisors (see below), whose sum is σ = 4802220450720. Its totient is φ = 708051170304.

The previous prime is 1917788045659. The next prime is 1917788045681. The reversal of 1917788045680 is 865408877191.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1917788045680² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1917788045681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14747986 + ... + 14877454.

It is an arithmetic number, because the mean of its divisors is an integer number (60027755634).

Almost surely, 2^{1917788045680} is an apocalyptic number.

1917788045680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1917788045680 is an abundant number, since it is smaller than the sum of its proper divisors (2884432405040).

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

1917788045680 is a wasteful number, since it uses less digits than its factorization.

1917788045680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143738 (or 143732 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 64.

The spelling of 1917788045680 in words is "one trillion, nine hundred seventeen billion, seven hundred eighty-eight million, forty-five thousand, six hundred eighty".