261646246657507 has 2 divisors, whose sum is σ = 261646246657508. Its totient is φ = 261646246657506.

The previous prime is 261646246657403. The next prime is 261646246657547. The reversal of 261646246657507 is 705756642646162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261646246657507 - 2³⁵ = 261611886919139 is a prime.

It is not a weakly prime, because it can be changed into another prime (261646246657547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130823123328753 + 130823123328754.

It is an arithmetic number, because the mean of its divisors is an integer number (130823123328754).

Almost surely, 2^{261646246657507} is an apocalyptic number.

261646246657507 is a deficient number, since it is larger than the sum of its proper divisors (1).

261646246657507 is an equidigital number, since it uses as much as digits as its factorization.

261646246657507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 609638400, while the sum is 67.

The spelling of 261646246657507 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-six million, six hundred fifty-seven thousand, five hundred seven".