620661552777 has 24 divisors (see below), whose sum is σ = 1024606377600. Its totient is φ = 354656050560.

The previous prime is 620661552701. The next prime is 620661552809. The reversal of 620661552777 is 777255166026.

620661552777 is a `hidden beast` number, since 6 + 20 + 6 + 61 + 552 + 7 + 7 + 7 = 666.

It is not a de Polignac number, because 620661552777 - 2¹⁰ = 620661551753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620661551777) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 4164849 + ... + 4311297.

It is an arithmetic number, because the mean of its divisors is an integer number (42691932400).

Almost surely, 2^620661552777 is an apocalyptic number.

It is an amenable number.

620661552777 is a deficient number, since it is larger than the sum of its proper divisors (403944824823).

620661552777 is a wasteful number, since it uses less digits than its factorization.

620661552777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213733 (or 213730 counting only the distinct ones).

The product of its (nonzero) digits is 7408800, while the sum is 54.

The spelling of 620661552777 in words is "six hundred twenty billion, six hundred sixty-one million, five hundred fifty-two thousand, seven hundred seventy-seven".