261337026722 has 6 divisors (see below), whose sum is σ = 392006624529. Its totient is φ = 130668151880.

The previous prime is 261337026673. The next prime is 261337026817. The reversal of 261337026722 is 227620733162.

It can be written as a sum of positive squares in 2 ways, for example, as 232749318481 + 28587708241 = 482441^2 + 169079^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=361481.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261337026722.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 542222 + ... + 903702.

Almost surely, 2^261337026722 is an apocalyptic number.

261337026722 is a deficient number, since it is larger than the sum of its proper divisors (130669597807).

261337026722 is an frugal number, since it uses more digits than its factorization.

261337026722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722964 (or 361483 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 41.

Adding to 261337026722 its reverse (227620733162), we get a palindrome (488957759884).

The spelling of 261337026722 in words is "two hundred sixty-one billion, three hundred thirty-seven million, twenty-six thousand, seven hundred twenty-two".