261155562607 has 2 divisors, whose sum is σ = 261155562608. Its totient is φ = 261155562606.

The previous prime is 261155562601. The next prime is 261155562667. The reversal of 261155562607 is 706265551162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261155562607 - 2¹¹ = 261155560559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261155562601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130577781303 + 130577781304.

It is an arithmetic number, because the mean of its divisors is an integer number (130577781304).

Almost surely, 2^261155562607 is an apocalyptic number.

261155562607 is a deficient number, since it is larger than the sum of its proper divisors (1).

261155562607 is an equidigital number, since it uses as much as digits as its factorization.

261155562607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756000, while the sum is 46.

The spelling of 261155562607 in words is "two hundred sixty-one billion, one hundred fifty-five million, five hundred sixty-two thousand, six hundred seven".