261647453722367 has 16 divisors (see below), whose sum is σ = 285976770105600. Its totient is φ = 238311367557120.

The previous prime is 261647453722363. The next prime is 261647453722393. The reversal of 261647453722367 is 763227354746162.

It is a cyclic number.

It is not a de Polignac number, because 261647453722367 - 2² = 261647453722363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261647453722363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102606359 + ... + 105125447.

It is an arithmetic number, because the mean of its divisors is an integer number (17873548131600).

Almost surely, 2^{261647453722367} is an apocalyptic number.

261647453722367 is a deficient number, since it is larger than the sum of its proper divisors (24329316383233).

261647453722367 is a wasteful number, since it uses less digits than its factorization.

261647453722367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716226.

The product of its digits is 426746880, while the sum is 65.

The spelling of 261647453722367 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, four hundred fifty-three million, seven hundred twenty-two thousand, three hundred sixty-seven".