261433418200679 has 2 divisors, whose sum is σ = 261433418200680. Its totient is φ = 261433418200678.

The previous prime is 261433418200651. The next prime is 261433418200693. The reversal of 261433418200679 is 976002814334162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261433418200679 is a prime.

It is a super-2 number, since 2×261433418200679² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261433418200639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130716709100339 + 130716709100340.

It is an arithmetic number, because the mean of its divisors is an integer number (130716709100340).

Almost surely, 2^{261433418200679} is an apocalyptic number.

261433418200679 is a deficient number, since it is larger than the sum of its proper divisors (1).

261433418200679 is an equidigital number, since it uses as much as digits as its factorization.

261433418200679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 261433418200679 in words is "two hundred sixty-one trillion, four hundred thirty-three billion, four hundred eighteen million, two hundred thousand, six hundred seventy-nine".