1897772777980 has 48 divisors (see below), whose sum is σ = 4155210501120. Its totient is φ = 727161781248.

The previous prime is 1897772777947. The next prime is 1897772778037. The reversal of 1897772777980 is 897772777981.

It is a self number, because there is not a number n which added to its sum of digits gives 1897772777980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12808317 + ... + 12955636.

It is an arithmetic number, because the mean of its divisors is an integer number (86566885440).

Almost surely, 2^{1897772777980} is an apocalyptic number.

1897772777980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897772777980 is an abundant number, since it is smaller than the sum of its proper divisors (2257437723140).

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

1897772777980 is a wasteful number, since it uses less digits than its factorization.

1897772777980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25764118 (or 25764116 counting only the distinct ones).

The product of its (nonzero) digits is 1219784832, while the sum is 79.

Subtracting from 1897772777980 its reverse (897772777981), we obtain a palindrome (999999999999).

The spelling of 1897772777980 in words is "one trillion, eight hundred ninety-seven billion, seven hundred seventy-two million, seven hundred seventy-seven thousand, nine hundred eighty".