1977116722668 has 60 divisors (see below), whose sum is σ = 5168706116112. Its totient is φ = 659022017760.

The previous prime is 1977116722667. The next prime is 1977116722723. The reversal of 1977116722668 is 8662276117791.

1977116722668 is a `hidden beast` number, since 197 + 7 + 1 + 167 + 226 + 68 = 666.

It is not an unprimeable number, because it can be changed into a prime (1977116722667) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24167473 + ... + 24249143.

Almost surely, 2^{1977116722668} is an apocalyptic number.

1977116722668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1977116722668 is an abundant number, since it is smaller than the sum of its proper divisors (3191589393444).

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

1977116722668 is a wasteful number, since it uses less digits than its factorization.

1977116722668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156404 (or 156393 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 1977116722668 in words is "one trillion, nine hundred seventy-seven billion, one hundred sixteen million, seven hundred twenty-two thousand, six hundred sixty-eight".