1977193845020 has 48 divisors (see below), whose sum is σ = 4209027429600. Its totient is φ = 780079027200.

The previous prime is 1977193844999. The next prime is 1977193845061. The reversal of 1977193845020 is 205483917791.

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, 629906 + ... + 2085945.

It is an arithmetic number, because the mean of its divisors is an integer number (87688071450).

Almost surely, 2^{1977193845020} is an apocalyptic number.

1977193845020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1977193845020 is an abundant number, since it is smaller than the sum of its proper divisors (2231833584580).

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

1977193845020 is a wasteful number, since it uses less digits than its factorization.

1977193845020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716358 (or 2716356 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 56.

The spelling of 1977193845020 in words is "one trillion, nine hundred seventy-seven billion, one hundred ninety-three million, eight hundred forty-five thousand, twenty".