206156826865 has 16 divisors (see below), whose sum is σ = 269909490816. Its totient is φ = 149914758400.

The previous prime is 206156826857. The next prime is 206156826881. The reversal of 206156826865 is 568628651602.

It is a happy number.

It is not a de Polignac number, because 206156826865 - 2³ = 206156826857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267300 + ... + 695530.

It is an arithmetic number, because the mean of its divisors is an integer number (16869343176).

Almost surely, 2^206156826865 is an apocalyptic number.

It is an amenable number.

206156826865 is a deficient number, since it is larger than the sum of its proper divisors (63752663951).

206156826865 is a wasteful number, since it uses less digits than its factorization.

206156826865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437000.

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 206156826865 in words is "two hundred six billion, one hundred fifty-six million, eight hundred twenty-six thousand, eight hundred sixty-five".