209706340051 has 8 divisors (see below), whose sum is σ = 225848592144. Its totient is φ = 193565658720.

The previous prime is 209706340031. The next prime is 209706340141. The reversal of 209706340051 is 150043607902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209706340051 - 2¹¹ = 209706338003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209706340001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107740 + ... + 656521.

It is an arithmetic number, because the mean of its divisors is an integer number (28231074018).

Almost surely, 2^209706340051 is an apocalyptic number.

209706340051 is a deficient number, since it is larger than the sum of its proper divisors (16142252093).

209706340051 is a wasteful number, since it uses less digits than its factorization.

209706340051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785381.

The product of its (nonzero) digits is 45360, while the sum is 37.

Adding to 209706340051 its reverse (150043607902), we get a palindrome (359749947953).

The spelling of 209706340051 in words is "two hundred nine billion, seven hundred six million, three hundred forty thousand, fifty-one".