261656302726352 has 10 divisors (see below), whose sum is σ = 506959086532338. Its totient is φ = 130828151363168.

The previous prime is 261656302726319. The next prime is 261656302726367. The reversal of 261656302726352 is 253627203656162.

It can be written as a sum of positive squares in only one way, i.e., 260232519212176 + 1423783514176 = 16131724^2 + 1193224^2 .

It is a super-2 number, since 2×261656302726352² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8176759460183 + ... + 8176759460214.

Almost surely, 2^{261656302726352} is an apocalyptic number.

It is an amenable number.

261656302726352 is a deficient number, since it is larger than the sum of its proper divisors (245302783805986).

261656302726352 is a wasteful number, since it uses less digits than its factorization.

261656302726352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16353518920405 (or 16353518920399 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 56.

The spelling of 261656302726352 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, three hundred two million, seven hundred twenty-six thousand, three hundred fifty-two".