620661205161 has 16 divisors (see below), whose sum is σ = 967892718400. Its totient is φ = 391996550304.

The previous prime is 620661205139. The next prime is 620661205163. The reversal of 620661205161 is 161502166026.

620661205161 is a `hidden beast` number, since 6 + 20 + 6 + 612 + 0 + 5 + 16 + 1 = 666.

It is not a de Polignac number, because 620661205161 - 2²⁵ = 620627650729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620661205163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604932436 + ... + 604933461.

It is an arithmetic number, because the mean of its divisors is an integer number (60493294900).

Almost surely, 2^620661205161 is an apocalyptic number.

It is an amenable number.

620661205161 is a deficient number, since it is larger than the sum of its proper divisors (347231513239).

620661205161 is a wasteful number, since it uses less digits than its factorization.

620661205161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209865925 (or 1209865919 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 620661205161 in words is "six hundred twenty billion, six hundred sixty-one million, two hundred five thousand, one hundred sixty-one".