866109601 has 4 divisors (see below), whose sum is σ = 989839552. Its totient is φ = 742379652.

The previous prime is 866109583. The next prime is 866109611. The reversal of 866109601 is 106901668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 866109601 - 2¹¹ = 866107553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866109611) 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, 61864965 + ... + 61864978.

It is an arithmetic number, because the mean of its divisors is an integer number (247459888).

Almost surely, 2^866109601 is an apocalyptic number.

It is an amenable number.

866109601 is a deficient number, since it is larger than the sum of its proper divisors (123729951).

866109601 is a wasteful number, since it uses less digits than its factorization.

866109601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123729950.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 866109601 is about 29429.7400770037. The cubic root of 866109601 is about 953.2151823382.

The spelling of 866109601 in words is "eight hundred sixty-six million, one hundred nine thousand, six hundred one".