261062690864 has 20 divisors (see below), whose sum is σ = 518145768840. Its totient is φ = 127347653760.

The previous prime is 261062690849. The next prime is 261062690869. The reversal of 261062690864 is 468096260162.

It is a super-2 number, since 2×261062690864² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261062690869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198980054 + ... + 198981365.

It is an arithmetic number, because the mean of its divisors is an integer number (25907288442).

Almost surely, 2^261062690864 is an apocalyptic number.

It is an amenable number.

261062690864 is a deficient number, since it is larger than the sum of its proper divisors (257083077976).

261062690864 is a wasteful number, since it uses less digits than its factorization.

261062690864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397961468 (or 397961462 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 261062690864 in words is "two hundred sixty-one billion, sixty-two million, six hundred ninety thousand, eight hundred sixty-four".