866728525097 has 4 divisors (see below), whose sum is σ = 868508255616. Its totient is φ = 864948794580.

The previous prime is 866728525093. The next prime is 866728525127. The reversal of 866728525097 is 790525827668.

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 a cyclic number.

It is not a de Polignac number, because 866728525097 - 2² = 866728525093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866728525093) 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, 889864529 + ... + 889865502.

It is an arithmetic number, because the mean of its divisors is an integer number (217127063904).

Almost surely, 2^866728525097 is an apocalyptic number.

It is an amenable number.

866728525097 is a deficient number, since it is larger than the sum of its proper divisors (1779730519).

866728525097 is a wasteful number, since it uses less digits than its factorization.

866728525097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779730518.

The product of its (nonzero) digits is 101606400, while the sum is 65.

The spelling of 866728525097 in words is "eight hundred sixty-six billion, seven hundred twenty-eight million, five hundred twenty-five thousand, ninety-seven".