4261558523661 has 6 divisors (see below), whose sum is σ = 6155584534190. Its totient is φ = 2841039015768.

The previous prime is 4261558523659. The next prime is 4261558523713. The reversal of 4261558523661 is 1663258551624.

4261558523661 is a `hidden beast` number, since 4 + 2 + 6 + 1 + 5 + 58 + 523 + 6 + 61 = 666.

4261558523661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2500082757225 + 1761475766436 = 1581165^2 + 1327206^2 .

It is not a de Polignac number, because 4261558523661 - 2¹ = 4261558523659 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4261558523598 and 4261558523607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4261558523461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 236753251306 + ... + 236753251323.

Almost surely, 2^{4261558523661} is an apocalyptic number.

It is an amenable number.

4261558523661 is a deficient number, since it is larger than the sum of its proper divisors (1894026010529).

4261558523661 is a wasteful number, since it uses less digits than its factorization.

4261558523661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473506502635 (or 473506502632 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 54.

The spelling of 4261558523661 in words is "four trillion, two hundred sixty-one billion, five hundred fifty-eight million, five hundred twenty-three thousand, six hundred sixty-one".