1798779541780 has 24 divisors (see below), whose sum is σ = 4068009118152. Its totient is φ = 664164753792.

The previous prime is 1798779541771. The next prime is 1798779541787. The reversal of 1798779541780 is 871459778971.

It can be written as a sum of positive squares in 4 ways, for example, as 41230114704 + 1757549427076 = 203052^2 + 1325726^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798779541787) 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, 3459191167 + ... + 3459191686.

It is an arithmetic number, because the mean of its divisors is an integer number (169500379923).

Almost surely, 2^{1798779541780} is an apocalyptic number.

1798779541780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1798779541780 is an abundant number, since it is smaller than the sum of its proper divisors (2269229576372).

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

1798779541780 is a wasteful number, since it uses less digits than its factorization.

1798779541780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6918382875 (or 6918382873 counting only the distinct ones).

The product of its (nonzero) digits is 248935680, while the sum is 73.

The spelling of 1798779541780 in words is "one trillion, seven hundred ninety-eight billion, seven hundred seventy-nine million, five hundred forty-one thousand, seven hundred eighty".