866761280625043 has 4 divisors (see below), whose sum is σ = 868109276396488. Its totient is φ = 865413284853600.

The previous prime is 866761280624999. The next prime is 866761280625049. The reversal of 866761280625043 is 340526082167668.

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 866761280625043 - 2¹⁷ = 866761280493971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866761280625049) 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, 673997884758 + ... + 673997886043.

It is an arithmetic number, because the mean of its divisors is an integer number (217027319099122).

Almost surely, 2^{866761280625043} is an apocalyptic number.

866761280625043 is a deficient number, since it is larger than the sum of its proper divisors (1347995771445).

866761280625043 is a wasteful number, since it uses less digits than its factorization.

866761280625043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347995771444.

The product of its (nonzero) digits is 139345920, while the sum is 64.

The spelling of 866761280625043 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred eighty million, six hundred twenty-five thousand, forty-three".