261279162820716 has 24 divisors (see below), whose sum is σ = 615570325353984. Its totient is φ = 86247490639440.

The previous prime is 261279162820703. The next prime is 261279162820729. The reversal of 261279162820716 is 617028261972162.

It is an interprime number because it is at equal distance from previous prime (261279162820703) and next prime (261279162820729).

It is a super-2 number, since 2×261279162820716² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261279162820716.

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, 105695452980 + ... + 105695455451.

It is an arithmetic number, because the mean of its divisors is an integer number (25648763556416).

Almost surely, 2^{261279162820716} is an apocalyptic number.

It is an amenable number.

261279162820716 is an abundant number, since it is smaller than the sum of its proper divisors (354291162533268).

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

261279162820716 is a wasteful number, since it uses less digits than its factorization.

261279162820716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211390908541 (or 211390908539 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 261279162820716 in words is "two hundred sixty-one trillion, two hundred seventy-nine billion, one hundred sixty-two million, eight hundred twenty thousand, seven hundred sixteen".