261205513627 has 2 divisors, whose sum is σ = 261205513628. Its totient is φ = 261205513626.

The previous prime is 261205513619. The next prime is 261205513643. The reversal of 261205513627 is 726315502162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261205513627 - 2³ = 261205513619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261205513627.

It is not a weakly prime, because it can be changed into another prime (261205513027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130602756813 + 130602756814.

It is an arithmetic number, because the mean of its divisors is an integer number (130602756814).

Almost surely, 2^261205513627 is an apocalyptic number.

261205513627 is a deficient number, since it is larger than the sum of its proper divisors (1).

261205513627 is an equidigital number, since it uses as much as digits as its factorization.

261205513627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 261205513627 in words is "two hundred sixty-one billion, two hundred five million, five hundred thirteen thousand, six hundred twenty-seven".