261002350531266 has 16 divisors (see below), whose sum is σ = 522010934141088. Its totient is φ = 86999744664000.

The previous prime is 261002350531231. The next prime is 261002350531271. The reversal of 261002350531266 is 662135053200162.

It is a happy number.

It is a super-3 number, since 3×261002350531266³ (a number of 44 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259167160 + ... + 260172291.

It is an arithmetic number, because the mean of its divisors is an integer number (32625683383818).

Almost surely, 2^{261002350531266} is an apocalyptic number.

261002350531266 is an abundant number, since it is smaller than the sum of its proper divisors (261008583609822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261002350531266 is a wasteful number, since it uses less digits than its factorization.

261002350531266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519423217.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 261002350531266 in words is "two hundred sixty-one trillion, two billion, three hundred fifty million, five hundred thirty-one thousand, two hundred sixty-six".