261154425635623 has 16 divisors (see below), whose sum is σ = 281297828331520. Its totient is φ = 241018826020704.

The previous prime is 261154425635611. The next prime is 261154425635629. The reversal of 261154425635623 is 326536524451162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261154425635623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261154425635629) 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, 3411827290 + ... + 3411903832.

It is an arithmetic number, because the mean of its divisors is an integer number (17581114270720).

Almost surely, 2^{261154425635623} is an apocalyptic number.

261154425635623 is a deficient number, since it is larger than the sum of its proper divisors (20143402695897).

261154425635623 is a wasteful number, since it uses less digits than its factorization.

261154425635623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124078.

The product of its digits is 31104000, while the sum is 55.

The spelling of 261154425635623 in words is "two hundred sixty-one trillion, one hundred fifty-four billion, four hundred twenty-five million, six hundred thirty-five thousand, six hundred twenty-three".