261544475677061 has 8 divisors (see below), whose sum is σ = 262197684472704. Its totient is φ = 260891271748800.

The previous prime is 261544475677049. The next prime is 261544475677073. The reversal of 261544475677061 is 160776574445162.

It is an interprime number because it is at equal distance from previous prime (261544475677049) and next prime (261544475677073).

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 261544475677061 - 2¹⁸ = 261544475414917 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 (261544475677081) 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, 121924610 + ... + 124051196.

It is an arithmetic number, because the mean of its divisors is an integer number (32774710559088).

Almost surely, 2^{261544475677061} is an apocalyptic number.

It is an amenable number.

261544475677061 is a deficient number, since it is larger than the sum of its proper divisors (653208795643).

261544475677061 is a wasteful number, since it uses less digits than its factorization.

261544475677061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433691.

The product of its (nonzero) digits is 237081600, while the sum is 65.

The spelling of 261544475677061 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred seventy-five million, six hundred seventy-seven thousand, sixty-one".