261238940968 has 16 divisors (see below), whose sum is σ = 494672748660. Its totient is φ = 129326208000.

The previous prime is 261238940951. The next prime is 261238940983. The reversal of 261238940968 is 869049832162.

261238940968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 196711764484 + 64527176484 = 443522^2 + 254022^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161656953 + ... + 161658568.

Almost surely, 2^261238940968 is an apocalyptic number.

It is an amenable number.

261238940968 is a deficient number, since it is larger than the sum of its proper divisors (233433807692).

261238940968 is a wasteful number, since it uses less digits than its factorization.

261238940968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323315628 (or 323315624 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 58.

The spelling of 261238940968 in words is "two hundred sixty-one billion, two hundred thirty-eight million, nine hundred forty thousand, nine hundred sixty-eight".