261482453073561 has 24 divisors (see below), whose sum is σ = 370359437422240. Its totient is φ = 164066818678272.

The previous prime is 261482453073553. The next prime is 261482453073587. The reversal of 261482453073561 is 165370354284162.

It is not a de Polignac number, because 261482453073561 - 2³ = 261482453073553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261482453473561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 416200710 + ... + 416828496.

Almost surely, 2^{261482453073561} is an apocalyptic number.

It is an amenable number.

261482453073561 is a deficient number, since it is larger than the sum of its proper divisors (108876984348679).

261482453073561 is a wasteful number, since it uses less digits than its factorization.

261482453073561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108233 (or 1108216 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 57.

The spelling of 261482453073561 in words is "two hundred sixty-one trillion, four hundred eighty-two billion, four hundred fifty-three million, seventy-three thousand, five hundred sixty-one".