261564252541035 has 32 divisors (see below), whose sum is σ = 428711958868032. Its totient is φ = 136097911173120.

The previous prime is 261564252541003. The next prime is 261564252541043. The reversal of 261564252541035 is 530145252465162.

It is not a de Polignac number, because 261564252541035 - 2⁵ = 261564252541003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177812467 + ... + 179277443.

It is an arithmetic number, because the mean of its divisors is an integer number (13397248714626).

Almost surely, 2^{261564252541035} is an apocalyptic number.

261564252541035 is a deficient number, since it is larger than the sum of its proper divisors (167147706326997).

261564252541035 is a wasteful number, since it uses less digits than its factorization.

261564252541035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755343.

The product of its (nonzero) digits is 8640000, while the sum is 51.

The spelling of 261564252541035 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred fifty-two million, five hundred forty-one thousand, thirty-five".