261986487143 has 4 divisors (see below), whose sum is σ = 262006247640. Its totient is φ = 261966726648.

The previous prime is 261986487137. The next prime is 261986487163. The reversal of 261986487143 is 341784689162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261986487143 - 2³⁰ = 260912745319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261986487163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9860348 + ... + 9886881.

It is an arithmetic number, because the mean of its divisors is an integer number (65501561910).

Almost surely, 2^261986487143 is an apocalyptic number.

261986487143 is a deficient number, since it is larger than the sum of its proper divisors (19760497).

261986487143 is a wasteful number, since it uses less digits than its factorization.

261986487143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19760496.

The product of its digits is 13934592, while the sum is 59.

The spelling of 261986487143 in words is "two hundred sixty-one billion, nine hundred eighty-six million, four hundred eighty-seven thousand, one hundred forty-three".