209787958051 has 48 divisors (see below), whose sum is σ = 256758798240. Its totient is φ = 170668270080.

The previous prime is 209787958043. The next prime is 209787958073. The reversal of 209787958051 is 150859787902.

It is not a de Polignac number, because 209787958051 - 2³ = 209787958043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209787958001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51504951 + ... + 51509023.

It is an arithmetic number, because the mean of its divisors is an integer number (5349141630).

Almost surely, 2^209787958051 is an apocalyptic number.

209787958051 is a deficient number, since it is larger than the sum of its proper divisors (46970840189).

209787958051 is a wasteful number, since it uses less digits than its factorization.

209787958051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724 (or 4717 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 61.

The spelling of 209787958051 in words is "two hundred nine billion, seven hundred eighty-seven million, nine hundred fifty-eight thousand, fifty-one".