261552373055155 has 16 divisors (see below), whose sum is σ = 386292735589824. Its totient is φ = 165554029537920.

The previous prime is 261552373055147. The next prime is 261552373055161. The reversal of 261552373055155 is 551550373255162.

It is a happy number.

It is not a de Polignac number, because 261552373055155 - 2³ = 261552373055147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261552373055096 and 261552373055105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287420189716 + ... + 287420190625.

It is an arithmetic number, because the mean of its divisors is an integer number (24143295974364).

Almost surely, 2^{261552373055155} is an apocalyptic number.

261552373055155 is a deficient number, since it is larger than the sum of its proper divisors (124740362534669).

261552373055155 is a wasteful number, since it uses less digits than its factorization.

261552373055155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574840380366.

The product of its (nonzero) digits is 23625000, while the sum is 55.

The spelling of 261552373055155 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, three hundred seventy-three million, fifty-five thousand, one hundred fifty-five".