211794957139577 has 6 divisors (see below), whose sum is σ = 246373725652218. Its totient is φ = 181538534691024.

The previous prime is 211794957139573. The next prime is 211794957139609. The reversal of 211794957139577 is 775931759497112.

It can be written as a sum of positive squares in only one way, i.e., 207655477985536 + 4139479154041 = 14410256^2 + 2034571^2 .

It is not a de Polignac number, because 211794957139577 - 2² = 211794957139573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211794957139498 and 211794957139507.

It is not an unprimeable number, because it can be changed into a prime (211794957139573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2161173031988 + ... + 2161173032085.

It is an arithmetic number, because the mean of its divisors is an integer number (41062287608703).

Almost surely, 2^{211794957139577} is an apocalyptic number.

It is an amenable number.

211794957139577 is a deficient number, since it is larger than the sum of its proper divisors (34578768512641).

211794957139577 is an equidigital number, since it uses as much as digits as its factorization.

211794957139577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322346064087 (or 4322346064080 counting only the distinct ones).

The product of its digits is 1050197400, while the sum is 77.

The spelling of 211794957139577 in words is "two hundred eleven trillion, seven hundred ninety-four billion, nine hundred fifty-seven million, one hundred thirty-nine thousand, five hundred seventy-seven".