1977990543216 has 50 divisors (see below), whose sum is σ = 5724878497272. Its totient is φ = 659330180640.

The previous prime is 1977990543187. The next prime is 1977990543241. The reversal of 1977990543216 is 6123450997791.

1977990543216 is a `hidden beast` number, since 1 + 9 + 7 + 79 + 9 + 0 + 543 + 2 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 763112340 + ... + 763114931.

Almost surely, 2^{1977990543216} is an apocalyptic number.

1977990543216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1977990543216 is an abundant number, since it is smaller than the sum of its proper divisors (3746887954056).

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

1977990543216 is a wasteful number, since it uses less digits than its factorization.

1977990543216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526227291 (or 1526227276 counting only the distinct ones).

The product of its (nonzero) digits is 25719120, while the sum is 63.

The spelling of 1977990543216 in words is "one trillion, nine hundred seventy-seven billion, nine hundred ninety million, five hundred forty-three thousand, two hundred sixteen".