212769539669 has 2 divisors, whose sum is σ = 212769539670. Its totient is φ = 212769539668.

The previous prime is 212769539651. The next prime is 212769539681. The reversal of 212769539669 is 966935967212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142604416900 + 70165122769 = 377630^2 + 264887^2 .

It is a cyclic number.

It is not a de Polignac number, because 212769539669 - 2³² = 208474572373 is a prime.

It is a super-2 number, since 2×212769539669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212769539699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106384769834 + 106384769835.

It is an arithmetic number, because the mean of its divisors is an integer number (106384769835).

Almost surely, 2^212769539669 is an apocalyptic number.

It is an amenable number.

212769539669 is a deficient number, since it is larger than the sum of its proper divisors (1).

212769539669 is an equidigital number, since it uses as much as digits as its factorization.

212769539669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66134880, while the sum is 65.

The spelling of 212769539669 in words is "two hundred twelve billion, seven hundred sixty-nine million, five hundred thirty-nine thousand, six hundred sixty-nine".