2156692205309 has 2 divisors, whose sum is σ = 2156692205310. Its totient is φ = 2156692205308.

The previous prime is 2156692205237. The next prime is 2156692205347. The reversal of 2156692205309 is 9035022966512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2028764376409 + 127927828900 = 1424347^2 + 357670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156692205309 - 2³⁶ = 2087972728573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156692205399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078346102654 + 1078346102655.

It is an arithmetic number, because the mean of its divisors is an integer number (1078346102655).

Almost surely, 2^{2156692205309} is an apocalyptic number.

It is an amenable number.

2156692205309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156692205309 is an equidigital number, since it uses as much as digits as its factorization.

2156692205309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 2156692205309 in words is "two trillion, one hundred fifty-six billion, six hundred ninety-two million, two hundred five thousand, three hundred nine".