261502463779 has 2 divisors, whose sum is σ = 261502463780. Its totient is φ = 261502463778.

The previous prime is 261502463767. The next prime is 261502463813. The reversal of 261502463779 is 977364205162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261502463779 - 2²¹ = 261500366627 is a prime.

It is not a weakly prime, because it can be changed into another prime (261502463759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130751231889 + 130751231890.

It is an arithmetic number, because the mean of its divisors is an integer number (130751231890).

Almost surely, 2^261502463779 is an apocalyptic number.

261502463779 is a deficient number, since it is larger than the sum of its proper divisors (1).

261502463779 is an equidigital number, since it uses as much as digits as its factorization.

261502463779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 261502463779 in words is "two hundred sixty-one billion, five hundred two million, four hundred sixty-three thousand, seven hundred seventy-nine".