206925974551 has 4 divisors (see below), whose sum is σ = 210318203704. Its totient is φ = 203533745400.

The previous prime is 206925974539. The next prime is 206925974561. The reversal of 206925974551 is 155479529602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206925974551 - 2²³ = 206917585943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206925974492 and 206925974501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206925974561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1696114485 + ... + 1696114606.

It is an arithmetic number, because the mean of its divisors is an integer number (52579550926).

Almost surely, 2^206925974551 is an apocalyptic number.

206925974551 is a deficient number, since it is larger than the sum of its proper divisors (3392229153).

206925974551 is an equidigital number, since it uses as much as digits as its factorization.

206925974551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392229152.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 206925974551 in words is "two hundred six billion, nine hundred twenty-five million, nine hundred seventy-four thousand, five hundred fifty-one".