261544420057701 has 16 divisors (see below), whose sum is σ = 380429830609920. Its totient is φ = 158511110043120.

The previous prime is 261544420057663. The next prime is 261544420057793. The reversal of 261544420057701 is 107750024445162.

261544420057701 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261544420057701 - 2¹³ = 261544420049509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261544420057301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8383245 + ... + 24359138.

It is an arithmetic number, because the mean of its divisors is an integer number (23776864413120).

Almost surely, 2^{261544420057701} is an apocalyptic number.

It is an amenable number.

261544420057701 is a deficient number, since it is larger than the sum of its proper divisors (118885410552219).

261544420057701 is a wasteful number, since it uses less digits than its factorization.

261544420057701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32984456.

The product of its (nonzero) digits is 1881600, while the sum is 48.

The spelling of 261544420057701 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred twenty million, fifty-seven thousand, seven hundred one".