261251807767 has 16 divisors (see below), whose sum is σ = 263516198400. Its totient is φ = 258999453280.

The previous prime is 261251807759. The next prime is 261251807777. The reversal of 261251807767 is 767708152162.

It is a cyclic number.

It is not a de Polignac number, because 261251807767 - 2³ = 261251807759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261251807777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68370717 + ... + 68374537.

It is an arithmetic number, because the mean of its divisors is an integer number (16469762400).

Almost surely, 2^261251807767 is an apocalyptic number.

261251807767 is a deficient number, since it is larger than the sum of its proper divisors (2264390633).

261251807767 is a wasteful number, since it uses less digits than its factorization.

261251807767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 261251807767 in words is "two hundred sixty-one billion, two hundred fifty-one million, eight hundred seven thousand, seven hundred sixty-seven".