261735630445 has 4 divisors (see below), whose sum is σ = 314082756540. Its totient is φ = 209388504352.

The previous prime is 261735630439. The next prime is 261735630451. The reversal of 261735630445 is 544036537162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (261735630439) and next prime (261735630451).

It can be written as a sum of positive squares in 2 ways, for example, as 129982601961 + 131753028484 = 360531^2 + 362978^2 .

It is a cyclic number.

It is not a de Polignac number, because 261735630445 - 2¹⁵ = 261735597677 is a prime.

It is a super-3 number, since 3×261735630445³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 261735630395 and 261735630404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26173563040 + ... + 26173563049.

It is an arithmetic number, because the mean of its divisors is an integer number (78520689135).

Almost surely, 2^261735630445 is an apocalyptic number.

It is an amenable number.

261735630445 is a deficient number, since it is larger than the sum of its proper divisors (52347126095).

261735630445 is an equidigital number, since it uses as much as digits as its factorization.

261735630445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52347126094.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 261735630445 in words is "two hundred sixty-one billion, seven hundred thirty-five million, six hundred thirty thousand, four hundred forty-five".