861268408943 has 4 divisors (see below), whose sum is σ = 861336716568. Its totient is φ = 861200101320.

The previous prime is 861268408909. The next prime is 861268409063. The reversal of 861268408943 is 349804862168.

It is a happy number.

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 861268408943 - 2¹² = 861268404847 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 (861268408043) 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, 34134896 + ... + 34160117.

It is an arithmetic number, because the mean of its divisors is an integer number (215334179142).

Almost surely, 2^861268408943 is an apocalyptic number.

861268408943 is a deficient number, since it is larger than the sum of its proper divisors (68307625).

861268408943 is a wasteful number, since it uses less digits than its factorization.

861268408943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68307624.

The product of its (nonzero) digits is 15925248, while the sum is 59.

The spelling of 861268408943 in words is "eight hundred sixty-one billion, two hundred sixty-eight million, four hundred eight thousand, nine hundred forty-three".