261692610481 has 3 divisors (see below), whose sum is σ = 261693122041. Its totient is φ = 261692098922.

The previous prime is 261692610469. The next prime is 261692610497. The reversal of 261692610481 is 184016296162.

It is a happy number.

The square root of 261692610481 is 511559.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 261692610481 - 2⁵ = 261692610449 is a prime.

It is a super-2 number, since 2×261692610481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261692610281) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 255780 + ... + 767338.

Almost surely, 2^261692610481 is an apocalyptic number.

261692610481 is the 511559-th square number.

261692610481 is the 255780-th centered octagonal number.

It is an amenable number.

261692610481 is a deficient number, since it is larger than the sum of its proper divisors (511560).

261692610481 is an frugal number, since it uses more digits than its factorization.

261692610481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023118 (or 511559 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 261692610481 in words is "two hundred sixty-one billion, six hundred ninety-two million, six hundred ten thousand, four hundred eighty-one".