261840283986 has 16 divisors (see below), whose sum is σ = 523874628000. Its totient is φ = 87247751328.

The previous prime is 261840283981. The next prime is 261840283993. The reversal of 261840283986 is 689382048162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261840283981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8068291 + ... + 8100678.

It is an arithmetic number, because the mean of its divisors is an integer number (32742164250).

Almost surely, 2^261840283986 is an apocalyptic number.

261840283986 is an abundant number, since it is smaller than the sum of its proper divisors (262034344014).

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

261840283986 is a wasteful number, since it uses less digits than its factorization.

261840283986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16171673.

The product of its (nonzero) digits is 7962624, while the sum is 57.

The spelling of 261840283986 in words is "two hundred sixty-one billion, eight hundred forty million, two hundred eighty-three thousand, nine hundred eighty-six".