261099158224969 has 3 divisors (see below), whose sum is σ = 261099174383533. Its totient is φ = 261099142066406.

The previous prime is 261099158224841. The next prime is 261099158225021. The reversal of 261099158224969 is 969422851990162.

The square root of 261099158224969 is 16158563.

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 261099158224969 - 2⁷ = 261099158224841 is a prime.

It is a super-2 number, since 2×261099158224969² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261099158224769) 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, 8079282 + ... + 24237844.

Almost surely, 2^{261099158224969} is an apocalyptic number.

261099158224969 is the 16158563-rd square number.

261099158224969 is the 8079282-nd centered octagonal number.

It is an amenable number.

261099158224969 is a deficient number, since it is larger than the sum of its proper divisors (16158564).

261099158224969 is an frugal number, since it uses more digits than its factorization.

261099158224969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32317126 (or 16158563 counting only the distinct ones).

The product of its (nonzero) digits is 302330880, while the sum is 73.

The spelling of 261099158224969 in words is "two hundred sixty-one trillion, ninety-nine billion, one hundred fifty-eight million, two hundred twenty-four thousand, nine hundred sixty-nine".