261552373055153 has 4 divisors (see below), whose sum is σ = 261654982854900. Its totient is φ = 261449763255408.

The previous prime is 261552373055147. The next prime is 261552373055161. The reversal of 261552373055153 is 351550373255162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 208999268635249 + 52553104419904 = 14456807^2 + 7249352^2 .

It is a cyclic number.

It is not a de Polignac number, because 261552373055153 - 2²⁰ = 261552372006577 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 = 261552373055095 and 261552373055104.

It is not an unprimeable number, because it can be changed into a prime (261552373055143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51304896050 + ... + 51304901147.

It is an arithmetic number, because the mean of its divisors is an integer number (65413745713725).

Almost surely, 2^{261552373055153} is an apocalyptic number.

It is an amenable number.

261552373055153 is a deficient number, since it is larger than the sum of its proper divisors (102609799747).

261552373055153 is a wasteful number, since it uses less digits than its factorization.

261552373055153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102609799746.

The product of its (nonzero) digits is 14175000, while the sum is 53.

The spelling of 261552373055153 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, three hundred seventy-three million, fifty-five thousand, one hundred fifty-three".