261696702969 has 45 divisors (see below), whose sum is σ = 409912030203. Its totient is φ = 160884517248.

The previous prime is 261696702959. The next prime is 261696702997. The reversal of 261696702969 is 969207696162.

The square root of 261696702969 is 511563.

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

261696702969 is a `hidden beast` number, since 2 + 616 + 9 + 6 + 7 + 0 + 2 + 9 + 6 + 9 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 251966853369 + 9729849600 = 501963^2 + 98640^2 .

It is not a de Polignac number, because 261696702969 - 2⁹ = 261696702457 is a prime.

It is a super-2 number, since 2×261696702969² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261696702929) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 259361937 + ... + 259362945.

Almost surely, 2^261696702969 is an apocalyptic number.

261696702969 is the 511563-rd square number.

261696702969 is the 255782-nd centered octagonal number.

It is an amenable number.

261696702969 is a deficient number, since it is larger than the sum of its proper divisors (148215327234).

261696702969 is an frugal number, since it uses more digits than its factorization.

261696702969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2076 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 26453952, while the sum is 63.

The spelling of 261696702969 in words is "two hundred sixty-one billion, six hundred ninety-six million, seven hundred two thousand, nine hundred sixty-nine".