261500366627 has 2 divisors, whose sum is σ = 261500366628. Its totient is φ = 261500366626.

The previous prime is 261500366599. The next prime is 261500366761. The reversal of 261500366627 is 726663005162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261500366627 - 2³² = 257205399331 is a prime.

It is a super-4 number, since 4×261500366627⁴ (a number of 47 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (261500366227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130750183313 + 130750183314.

It is an arithmetic number, because the mean of its divisors is an integer number (130750183314).

Almost surely, 2^261500366627 is an apocalyptic number.

261500366627 is a deficient number, since it is larger than the sum of its proper divisors (1).

261500366627 is an equidigital number, since it uses as much as digits as its factorization.

261500366627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 261500366627 in words is "two hundred sixty-one billion, five hundred million, three hundred sixty-six thousand, six hundred twenty-seven".