261205500555653 has 8 divisors (see below), whose sum is σ = 270212788982880. Its totient is φ = 252198225608560.

The previous prime is 261205500555631. The next prime is 261205500555661. The reversal of 261205500555653 is 356555005502162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261205500555653 - 2¹⁶ = 261205500490117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261205500555253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50823458 + ... + 55726428.

It is an arithmetic number, because the mean of its divisors is an integer number (33776598622860).

Almost surely, 2^{261205500555653} is an apocalyptic number.

It is an amenable number.

261205500555653 is a deficient number, since it is larger than the sum of its proper divisors (9007288427227).

261205500555653 is a wasteful number, since it uses less digits than its factorization.

261205500555653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6740067.

The product of its (nonzero) digits is 6750000, while the sum is 50.

The spelling of 261205500555653 in words is "two hundred sixty-one trillion, two hundred five billion, five hundred million, five hundred fifty-five thousand, six hundred fifty-three".