212642466761 has 2 divisors, whose sum is σ = 212642466762. Its totient is φ = 212642466760.

The previous prime is 212642466739. The next prime is 212642466769. The reversal of 212642466761 is 167664246212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211544803600 + 1097663161 = 459940^2 + 33131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212642466761 is a prime.

It is a super-2 number, since 2×212642466761² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212642466769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106321233380 + 106321233381.

It is an arithmetic number, because the mean of its divisors is an integer number (106321233381).

Almost surely, 2^212642466761 is an apocalyptic number.

It is an amenable number.

212642466761 is a deficient number, since it is larger than the sum of its proper divisors (1).

212642466761 is an equidigital number, since it uses as much as digits as its factorization.

212642466761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 47.

The spelling of 212642466761 in words is "two hundred twelve billion, six hundred forty-two million, four hundred sixty-six thousand, seven hundred sixty-one".