80977555620 has 288 divisors, whose sum is σ = 267058428000. Its totient is φ = 19743326208.

The previous prime is 80977555577. The next prime is 80977555643. The reversal of 80977555620 is 2655577908.

80977555620 is a `hidden beast` number, since 8 + 0 + 9 + 7 + 7 + 5 + 5 + 5 + 620 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 18545537124 + 62432018496 = 136182^2 + 249864^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 187014924 + ... + 187015356.

Almost surely, 2^80977555620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80977555620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133529214000).

80977555620 is an abundant number, since it is smaller than the sum of its proper divisors (186080872380).

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

80977555620 is a wasteful number, since it uses less digits than its factorization.

80977555620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 5292000, while the sum is 54.

The spelling of 80977555620 in words is "eighty billion, nine hundred seventy-seven million, five hundred fifty-five thousand, six hundred twenty".