206194874781 has 24 divisors (see below), whose sum is σ = 319841529984. Its totient is φ = 117814932480.

The previous prime is 206194874773. The next prime is 206194874881. The reversal of 206194874781 is 187478491602.

It is not a de Polignac number, because 206194874781 - 2³ = 206194874773 is a prime.

It is a super-2 number, since 2×206194874781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206194874881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1729996 + ... + 1845338.

It is an arithmetic number, because the mean of its divisors is an integer number (13326730416).

Almost surely, 2^206194874781 is an apocalyptic number.

206194874781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

206194874781 is a deficient number, since it is larger than the sum of its proper divisors (113646655203).

206194874781 is a wasteful number, since it uses less digits than its factorization.

206194874781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127521 (or 127514 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 57.

The spelling of 206194874781 in words is "two hundred six billion, one hundred ninety-four million, eight hundred seventy-four thousand, seven hundred eighty-one".