866620397345 has 8 divisors (see below), whose sum is σ = 1039957724520. Its totient is φ = 693287486080.

The previous prime is 866620397341. The next prime is 866620397387. The reversal of 866620397345 is 543793026668.

It is a happy number.

866620397345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 396304243729 + 470316153616 = 629527^2 + 685796^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 866620397345 - 2² = 866620397341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866620397341) 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, 655676 + ... + 1470765.

It is an arithmetic number, because the mean of its divisors is an integer number (129994715565).

Almost surely, 2^866620397345 is an apocalyptic number.

It is an amenable number.

866620397345 is a deficient number, since it is larger than the sum of its proper divisors (173337327175).

866620397345 is a wasteful number, since it uses less digits than its factorization.

866620397345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207955.

The product of its (nonzero) digits is 39191040, while the sum is 59.

The spelling of 866620397345 in words is "eight hundred sixty-six billion, six hundred twenty million, three hundred ninety-seven thousand, three hundred forty-five".