206101025505 has 80 divisors (see below), whose sum is σ = 389173752000. Its totient is φ = 104062008960.

The previous prime is 206101025497. The next prime is 206101025569. The reversal of 206101025505 is 505520101602.

206101025505 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 0 + 102 + 550 + 5 = 666.

It is not a de Polignac number, because 206101025505 - 2³ = 206101025497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11910910 + ... + 11928200.

It is an arithmetic number, because the mean of its divisors is an integer number (4864671900).

Almost surely, 2^206101025505 is an apocalyptic number.

It is an amenable number.

206101025505 is a deficient number, since it is larger than the sum of its proper divisors (183072726495).

206101025505 is a wasteful number, since it uses less digits than its factorization.

206101025505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18876 (or 18867 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 206101025505 in words is "two hundred six billion, one hundred one million, twenty-five thousand, five hundred five".