209212651633 has 2 divisors, whose sum is σ = 209212651634. Its totient is φ = 209212651632.

The previous prime is 209212651601. The next prime is 209212651651. The reversal of 209212651633 is 336156212902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201611776144 + 7600875489 = 449012^2 + 87183^2 .

It is a cyclic number.

It is not a de Polignac number, because 209212651633 - 2⁵ = 209212651601 is a prime.

It is a super-2 number, since 2×209212651633² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209212651663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104606325816 + 104606325817.

It is an arithmetic number, because the mean of its divisors is an integer number (104606325817).

Almost surely, 2^209212651633 is an apocalyptic number.

It is an amenable number.

209212651633 is a deficient number, since it is larger than the sum of its proper divisors (1).

209212651633 is an equidigital number, since it uses as much as digits as its factorization.

209212651633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 209212651633 in words is "two hundred nine billion, two hundred twelve million, six hundred fifty-one thousand, six hundred thirty-three".