261655437557303 has 16 divisors (see below), whose sum is σ = 267347110584960. Its totient is φ = 255992462229504.

The previous prime is 261655437557251. The next prime is 261655437557329. The reversal of 261655437557303 is 303755734556162.

It is a cyclic number.

It is not a de Polignac number, because 261655437557303 - 2⁴⁴ = 244063251512887 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 (261655437557363) 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, 33065783 + ... + 40207671.

It is an arithmetic number, because the mean of its divisors is an integer number (16709194411560).

Almost surely, 2^{261655437557303} is an apocalyptic number.

261655437557303 is a deficient number, since it is larger than the sum of its proper divisors (5691673027657).

261655437557303 is a wasteful number, since it uses less digits than its factorization.

261655437557303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143898.

The product of its (nonzero) digits is 238140000, while the sum is 62.

The spelling of 261655437557303 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, four hundred thirty-seven million, five hundred fifty-seven thousand, three hundred three".